scholarly journals Diversity of insect pests and natural enemies as influenced by growth stages and pest management practices in rice

2016 ◽  
Vol 41 (3) ◽  
pp. 461-470
Author(s):  
MA Bakar ◽  
MMH Khan
Keyword(s):  
Natural Enemies ◽  
Untreated Control ◽  
Management Practices ◽  
Insect Pests ◽  
Diversity Index ◽  
Diversity Indices ◽  
Reproductive Stage ◽  
Seedling Stage ◽  
Control Treatment ◽  
Growth Stages

In order to measure the diversity of insect pests and natural enemies in rice ecosystem, the present study was conducted in the research farm of Patuakhali Science and Technology University, Dumki, Patuakhali during the period from January to June, 2012 in boro rice season. Diversity indices of insect pests and their natural enemies were found to be affected by the combined effect of rice growth stages and management practices. Diversity indices of insect pests and their natural enemies differed according to treatments and crop growth stages. In case of insect pests, the untreated control treatment showed the highest diversity index (1.67) at maximum tillering stage and spray (Bipolar 55EC @ 10 ml/10 L of water) + perching at early tillering stage also showed highest richness (26.14) and the highest evenness (0.921) in spray at seedling stage. The highest reciprocal form of Berger-Parker's Dominance index (D) was found in untreated control at maximum tillering stage (3.03) for insect pests. In case of natural enemies, perching showed the highest diversity index (1.88) at reproductive stage. Spraying of insecticide at early tillering stage also showed highest richness (5.06) and the highest evenness (0.982) was in perching at seedling stage. The highest D value was found in perching at reproductive stage (4.67) for natural enemies.Bangladesh J. Agril. Res. 41(3): 461-470, September 2016

scholarly journals Abundance of arthropod insect pests and natural enemies in rice field as influenced by rice growth stages and neighboring crops

2017 ◽  
Vol 42 (2) ◽  
pp. 309-319
Author(s):  
P Mukherjee ◽  
MMH Khan
Keyword(s):  
Natural Enemies ◽  
Insect Pests ◽  
Ground Beetle ◽  
Stem Borer ◽  
Seedling Stage ◽  
Growth Stages ◽  
Stink Bug ◽  
Rice Growth ◽  
Rice Bug ◽  
Tree Habitat

Studies were conducted to record the abundance of arthropod insect pests and natural enemies in rice fields as influenced by rice growth stages and neighboring crops at the experimental farm of Patuakhali Science and Technology University (PSTU), Dumki, Patuakhali during 2012 in Boro rice season following randomized complete block design. Results indicated that rice-tree habitat showed the highest abundance of leafhoppers (100.75) followed by cricket (16.50), grasshoppers (15.25) and stink bugs (15.25). The lowest abundance of all insect pests was in rice-sesame habitat. No significant differences were found on the abundance of rice bug, rice hispa and stem borer populations. At seedling stage, the highest abundance of leafhopper (94.25) was recorded followed by grasshopper (47.00) and stink bug (26.50) while the lowest was stem borer (0.57) and rice hispa (6.00). At early tillering stage, maximum number of grasshopper (17.25) was recorded followed by cricket (7.00). At maximum tillering stage, the highest abundance of leafhoppers (122.5) was obtained followed by rice bug (62.00) and the lowest was the stink bug (7.00). At panical initiation stage, the highest abundance of rice bug (334.00) was recorded which was followed by leafhoppers (65.25) and the lowest was the cricket (15.75). No population of rice hispa and stem borer was recorded at maximum tillering and panical initiation stages. In case of natural enemies, the highest abundance of lady bird beetle (45.27) and damselfly (16.73) was found in rice-rice habitat. The highest abundance of ichneumonid wasp (57.53) was in rice-tree habitat and ground beetle (28.80) was in rice-sesame habitat. No significant differences were observed on the abundance of dragonfly, spider and dipteran fly among different habitats. Among different growth stages of rice plant, significantly the highest abundance of lady bird beetle was recorded at maximum tillering stage. The highest abundance of ichneumonid wasp and ground beetle was recorded at seedling stage. The highest abundance of damselfly, spider and dipteran fly was at early tillering stage. No significant difference was observed on the abundance of dragonfly among different rice growth stages.Bangladesh J. Agril. Res. 42(2): 309-319, June 2017

scholarly journals Studies on insect diversity in jasmine (Jasminum sambac L.) ecosystem

2021 ◽  
Vol 42 (6) ◽  
pp. 1470-1477
Author(s):  
U. Pirithiraj ◽  
◽  
R.P. Soundararajan ◽  
C.G.L. Justin ◽  
V. Lakshmanan ◽  
...  
Keyword(s):  
Natural Enemies ◽  
Management Practices ◽  
Insect Pests ◽  
Cropping Systems ◽  
Cropping System ◽  
Diversity Indices ◽  
Insect Diversity ◽  
Chemical Inputs ◽  
Abundance And Diversity ◽  
Jasminum Sambac

Aim: Study was carried out to record the abundance and diversity of insects in jasmine (Jasminum sambac L.) ecosystem. Methodology: To determine insect pests, natural enemies and non-insect diversity, fortnight observations were taken from second fortnight of September'19 to March'20 on insect population at three adjacent locations. Abundance and diversity indices were computed using mean data. The management practices, presence of weeds and adjacent cropping systems were also recorded at three locations to determine the reasons for variation in the diversity of organisms. Results: A total of 3335 individuals arthropods belonging to 55 species, which included 32 species of herbivores and 23 species of natural enemies were recorded throughout the study period. Location 3 had perennial crops in the vicinity, un-weeded ecosystem with no chemical inputs. Among various diversity indices calculated, Margalef Richness Index of herbivores was higher at location 3 (1.67) than location 1 (1.17) and 2 (0.76). Interpretation: The abundance and diversity of insects in different jasmine ecosystem depends on the chemical inputs and adjacent cropping system.

scholarly journals Population dynamics of stem fly and defoliator pests of soybean and their natural enemies in relation to weather parameters

2021 ◽  
Vol 17 (AAEBSSD) ◽  
pp. 17-26
Author(s):  
R. Bala Muralidhar Naik ◽  
K. Vijaya Lakshmi ◽  
M. Venkataiah ◽  
C. Srinivas ◽  
G. Uma Devi ◽  
...  
Keyword(s):  
Natural Enemies ◽  
Insect Pests ◽  
Agricultural Research ◽  
Growth Stages ◽  
Research Station ◽  
Peak Activity ◽  
Lepidopteran Insect ◽  
Weather Parameters ◽  
Lepidopteran Pest ◽  
Tobacco Caterpillar

The field experiment was carried out at Polasa Farm, Regional agricultural research station Jagtial during the Kharif, 2014-15 and 2015-16. Study about pre dominant lepidopteran insect –pests in soybean crop noticed that the tobacco cut worm, (Spodptera exigua Hubner), green semi looper(Crysodexis acuta Walker), and tobacco caterpillar (Spodoptera litura Fab) along with stemfly, (Melanagromyza obtusa Zehnter) as non lepidopteran pest were noticed at various growth stages of cropgrowth. The peak activity of stem fly (37.84%) was observed during 37th standard week per meter row) for the year 2014 and for the year 2015 to a maximum infestation of 35.70 per cent during 30th std.week. The peak activity of caterpillar pests i.e., S. litura (7.6 larvae per meter row) for the year 2014 was observed during 34th std.week and for the year 2015 (12.4 per meter row during 36th std.week and C. acuta (0.7 larvae per meter row) during 36th std. week for the year 2014 and for the year 2015 (2.20 larvae/mrl on 37th std week. S. exigua (1.6 larvae per meter row) for both the years 2014 and 2015 was observed during 32th std.week Among the natural enemies, one predators namely, spiders (Oxyopes sp. was observed to prey on the insect pests.The biocontrol agent’s one species, lynx spider, Oxyopes sp. population recorded on the crop during Kharif , 2014 ranged from 0.15 to 0.40 /mrl and 0.15 to 0.60/ mrl during Kharif, 2015.

Short-Term Dispersal and Long-Term Spatial and Temporal Patterns of Carabidae (Coleoptera) in Lowbush Blueberry Fields

2020 ◽  
Vol 49 (3) ◽  
pp. 572-579
Author(s):  
Alexandre M M C Loureiro ◽  
Vilis O Nams ◽  
Scott N White ◽  
G Christopher Cutler
Keyword(s):  
Natural Enemies ◽  
Management Practices ◽  
Community Dynamics ◽  
Insect Pests ◽  
Cropping Systems ◽  
Perennial Crop ◽  
Spatial And Temporal Patterns ◽  
Lowbush Blueberry ◽  
Field Edge ◽  
Carry Over

Abstract Carabidae (Coleoptera) are important natural enemies of many insect pests in various cropping systems. Their population dynamics and how they disperse determine how effective they are at carrying out the natural enemy function. There are robust patterns of community dynamics in annual cropping systems, but it is unclear if these would carry over into a relatively underexplored North American perennial crop. In Nova Scotia lowbush blueberry fields, we found that Carabidae diversity did not change with distance from field edge nor with time. Their activity density also did not change with time, but it did change with distance from field edge. We also found that the most abundant carabid of lowbush blueberry, Harpalus rufipes (De Geer) (Coleoptera: Carabidae), can disperse approximately 14.5 m/d. Our results shed more light on the community dynamics of Carabidae in lowbush blueberry fields and can help growers make informed decisions when it comes to incorporating natural enemies into their pest management practices.

scholarly journals Effect of sowing dates on the populations of three major insect pests and associated natural enemies throughout the growth stages of maize plants

2021 ◽  
Vol 90 (3 - Ahead of print) ◽  
pp. 130-144
Author(s):  
Hamdy H. Mahmoud ◽  
Soheir F. Abd El-Rahman ◽  
Magda H. Naroz ◽  
Sayeda S. Ahmed
Keyword(s):  
Natural Enemies ◽  
Insect Pests ◽  
Sowing Date ◽  
Growth Stages ◽  
Planting Dates ◽  
Formation Stage ◽  
Sowing Dates ◽  
Maize Varieties ◽  
Sesamia Cretica ◽  
Maize Plants

In Egypt, maize is an important crop that is attacked by various pests. In the present study, the effect of maize planting dates on the populations of insect pests and their natural enemies were investigated throughout the growth stages of maize plants. The maize planting dates were at the beginning of May, Jun, and July in the 2019 season and were repeated in the 2020 season. Samples were collected weekly to determine the populations of the insect pests, Limothrips cerealium (Haliday, 1836), Rhopalosiphum maidis (Fitch, 1856), and Sesamia cretica Lederer, 1857 and their natural predators. For the first sowing date, the infestation percentage of L. cerealium and S. cretica were most substantial, especially in the seedling and precorn formation stages. For the third sowing date, the number of R. maidis was most substantial, especially in the corn formation stage. Three predators were associated with these insect species; of these predators, Coccinella undecimpunctata (Linnaeus, 1758), Scymnus interruptus (Goeze, 1777), and Chrysoperla carnea (Stephens, 1836) were observed at the highest numbers during all sowing dates. A highly significant correlation existed between populations of S. interruptus and the three insects across the two seasons. Data suggest that the percentage of thrips, aphids, and stem borers infestations can be minimized by planting maize varieties in June.

scholarly journals Natural Enemy (Arthropoda-Insecta) Biodiversity in Vegetable Crops in Northeastern Tamil Nadu, India

2016 ◽  
Vol 53 ◽  
pp. 28-33
Author(s):  
Veeramuthu Anbalagan ◽  
Michael Gabriel Paulraj ◽  
Savarimuthu Ignacimuthu ◽  
Kathirvelu Baskar ◽  
Jonas Gunasekaran
Keyword(s):  
Natural Enemies ◽  
Tamil Nadu ◽  
Insect Pests ◽  
Diversity Index ◽  
Cropping Systems ◽  
Pitfall Traps ◽  
Vegetable Crops ◽  
Dominant Group ◽  
Wiener Diversity Index ◽  
Number Of Individuals

Natural enemies of insect pests in vegetable crops (brinjal, okra and tomato) were recorded and their diversity was studied in Kancheepuram and Tiruvallur Districts, Tamil Nadu. Natural enemies were collected by pitfall traps, sweeping nets and by hand picking from January 2011 to December 2013 twice in a month. Totally 129 species of predatory and parasitic insects were recorded. All the natural enemies were grouped into 50 families under eight different orders. Order hymenoptera contained the highest number of families and species. Among the predators, Coccinellidae (ladybird beetles) was found to be the dominant group with high number of species. It was clear that Coccinellidae, Staphylinidae, Carabidae and Pentatomidae were the predominant natural enemies throughout the study period. In 2013, formicidae formed the major family of occurrence from July to December in the vegetable fields; in this period the total number of individuals collected from all families was the highest. The maximum Shannon-Wiener diversity index was 3.70 during the second season in 2013. Maximum richness (5.99) was recorded in the second season of 2012. The variations in the diversity, species richness and evenness between two cropping systems are discussed in this paper.

Traits preferred by birds to attack on standing wheat crop under temperate condition and its prediction through random forest model

2021 ◽  
Vol 8 (01) ◽  
Author(s):  
Anil Kumar Singh ◽  
Lal Singh ◽  
Yasin J K ◽  
Rohan Kumar Raman ◽  
P K Sundram ◽  
...  
Keyword(s):  
Random Forest ◽  
Management Practices ◽  
Insect Pests ◽  
Reproductive Stage ◽  
Random Forest Model ◽  
Wheat Crop ◽  
Jammu And Kashmir ◽  
Forest Model ◽  
Wheat Germplasm ◽  
Percent Accuracy

Wheat is an important cool season cereal crop of India, production and quality get compromised due to biotic and abiotic stresses. Wheat is susceptible to a variety of diseases and insect pests, including birds. Birds attack on standing crop are not very often and extent and pattern of damage varies considerably, however, its management practices is generally not taken in to account. The bird preferred to attack wheat crops while they were in the reproductive stage, especially during milking to dough stage. The data collected over the course of a two-year field study in the Kashmir valley at Research Farm Srinagar (Jammu and Kashmir) has been subjected to Random Forest model to determine whether there is a trait-specific specific preference for attack if any. Random forest (RF) model identified five major features out of 13 selected features of wheat germplasm with seventy percent accuracy for parrot birds’ preferred to attack on wheat germplasm. RF Model suggests that taller height, having long spikes and a greater number of ears, along with more biomass and grain yields, could be possible traits that bird pest target during the reproductive stage. It was inferenced that the average performance of the random forest model demonstrated with model accuracy (71%), sensitivity (0.77), kappa 0.41 and receiver-operating-characteristic (ROC-0.74) and showed good fit for classification of parrot attack on wheat germplasm.

Aboveground Arthropod Composition, Abundance and Guild Structure in Upland Rice Agro-ecosystem at Matalam, North Cotabato, Philippines

2014 ◽  
Vol 9 (1) ◽  
Author(s):  
GINA D. BALLERAS ◽  
LEAH E. ENDONELA
Keyword(s):  
Natural Enemies ◽  
Management Practices ◽  
Biological Diversity ◽  
Developmental Stages ◽  
Insect Pests ◽  
Upland Rice ◽  
Social Wasp ◽  
Stem Borer ◽  
Rice Grain ◽  
Scirpophaga Incertulas

With the recent innovations in the field of ecological pest management,conservation and enhancement of biological diversity at any rice agro-ecosystemshas received considerable attention. The composition and abundance ofaboveground arthropods was assessed on upland rice fields in Matalam, NorthCotabato, Southern Mindanao, Philippines. Sampling and monitoring was doneusing malaise trapping, sweep netting and direct counting techniques. A total of29 arthropod species belonging to 21 families in nine orders were documented.The collected samples were comprised of 40% insect pests, 53% predators and7% parasitoids. The three most abundant insect pests were rice bug (Leptocorisaoratorius), rice seedling maggot (Atherigona oryzae), and pink stemborer (Sesamia inferens). The predators are dominated by lady bird beetle (Micraspis spp.), social wasp (unknown) and long-jawed spider (Tetragnatha maxillosa). Ichneumonids,Braconids and Tachinids, though in smaller numbers, were present throughoutthe cropping season. More importantly, the study reported the presence of four rice stem borer species – Scirpophaga innotta, Scirpophaga incertulas, Sesamia infere and Chilo suppressalis and two rice grain bug species – Paraeucosmetuspallicornis and Elasmolomus sordidus in Matalam. The occurrence, compositionand abundance of insect pests and associated natural enemies vary with ricegrowth and developmental stages. The negative Pearson’s correlation coefficient (r= -0.31) between the insect pests and natural enemies was attributed to effectivecultural management practices which have been developed through decades ofsubsistence upland rice farming.Keywords: Ecology, aboveground arthropods, upland rice agro-ecosystem, sampling andmonitoring, Philippines

scholarly journals Validation of Integrated Pest Management Practices for Rice Insect in North-west Region of Bangladesh

2015 ◽  
Vol 19 (1) ◽  
pp. 17-31 ◽  
Author(s):  
MN Bari ◽  
N Ahmed ◽  
SS Haque ◽  
MF Rabbi ◽  
KM Iftekharuddaula
Keyword(s):  
Integrated Pest Management ◽  
Pest Management ◽  
Natural Enemies ◽  
Management Practices ◽  
Gall Midge ◽  
Brown Planthopper ◽  
Control Treatment ◽  
Insect Infestation ◽  
Insecticide Application ◽  
Continuous Use

Integrated Pest Management (IPM), developed by the Bangladesh Rice Research Institute (BRRI) for management of rice insect pests, was demonstrated and validated through intensive investigation in farmer’s fields of Pirganj and Taraganj in Rangpur district during 2012–2014 in two T. Aman and Boro seasons. A portion of each farmer’s field kept under the respective farmers’ supervision without any intervention, which was treated as control treatment (T4). The other portion was managed with three treatment combinations ie, T1=Prophylactic use of insecticide, T2=Perching + sweeping + need based insecticide application and T3=Perching only. BRRI dhan52 and BRRI dhan58 were used in Aman and Boro seasons respectively. RCB design was followed with eight replications for data analysis. The insect infestation was monitored fortnightly by visual counting from 20 hills and also 20 complete sweeps. The insect infestation, yield and yield contributing characteristics were analysed by one way analysis of variance by Tukeys’ post hoc test. The objective of this studies were to validate and demonstrate the IPM techniques in farmers' field. Yellow stem borer, rice leaf roller, long horned cricket, grasshopper, green leafhopper, brown planthopper, white-backed planthopper and gall midge were found as pests in both the locations. However, insect infestation was below the economic threshold level (ETL). No significant differences were observed for insect infestation among the treatments. Natural enemies eg, spider, ladybird beetle, dragon fly, damsel fly, carabid beetle and staphylinid beetle were noticed in both the locations. In some seasons and also locations some natural enemies were not found particularly where indiscriminate/continuous insecticide was used. Thus, it was indicated that indiscriminate/continuous use of insecticide has the detrimental effect on the population of natural enemies. Also, refrained from insecticide application at early crop stages (30-40-day after transplanting) natural enemy populations increased, which might reduce insect population below the ETL. Significantly lower yield was observed at farmers managed fields in both the locations. Therefore, it was found that indiscriminate/continuous use of insecticide had no effect on yield and yield contributing characters of rice, when insect infestation below the ETL. So, farmers could avoid continuous/indiscriminate use of insecticide, which might ultimately save production cost and the environment from insecticidal pollution as well.Bangladesh Rice j. 2015, 19(1): 17-31

scholarly journals Weed Interference and Control in Cowpea Production: A Review

2017 ◽  
Vol 9 (12) ◽  
pp. 11 ◽  
Author(s):  
O. Adewale Osipitan
Keyword(s):  
Weed Control ◽  
Weed Management ◽  
Management Practices ◽  
Control Method ◽  
Insect Pests ◽  
Wide Spectrum ◽  
Growth Stages ◽  
Yield Losses ◽  
Weed Interference ◽  
Weed Removal

In spite of the great economic potential of cowpea as both domestic and commercial crop, a number of constraints, which include insect pests, diseases and weeds, limits its production in West and many parts of Africa. Weeds reduced cowpea yield and value by competing for light, water and nutrients. Cowpea suffers from weeds particularly when the crop is in the early growth stages before ground cover. Yield losses cause by weeds alone in cowpea production can be as high as 76% depending on the cowpea cultivar, environment and weed management practices. A timely weed removal at the critical period, which falls within the first 40 days of cowpea growth, would help to prevent an unacceptable yield. Weed management in cowpea has been with low technology. Hand weeding is the most widely used weed control method in cowpea but they are usually expensive and labour intensive. Cultural practices such as narrow row spacing and planting of early maturing varieties are also used for weed control in cowpea. Herbicides, which are relatively easy to use and less expensive, have not been widely adopted for weed control in cowpea. There are limited number of selective herbicides with wide spectrum for weed control in cowpea. However, an integrated practices that involved pre-emergence weed control using herbicides or physical weeding, and a supplementary weed removal that would ensure weed control up to 40 days after cowpea emergence could substantially prevent yield losses associated with weed interference.

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