Population dynamics of sucking insect pests of cotton and its correlation with abiotic factors

2015 ◽  
Vol 49 (5) ◽  
Author(s):  
Deepika Kalkal ◽  
Roshan Lal ◽  
K. K. Dahiya ◽  
Maan Singh ◽  
Ankit Kumar
Keyword(s):  
Population Dynamics ◽  
Insect Pests ◽  
Abiotic Factors ◽  
Threshold Level ◽  
Economic Threshold ◽  
Whitefly Population ◽  
Leaf Hopper ◽  
Significant Difference

The research was conducted during <italic>kharif</italic> seasons of 2008 and 2009. Nineteen genotypes comprising of seventeen <italic>Bt</italic> hybrids, one conventional hybrid and one variety were evaluated for their reaction to sucking insect pests, under unsprayed condition. Observations on sucking pests were recorded at weekly intervals. The highest population of leaf hopper was recorded during 28<sup>th</sup> and 32<sup>nd</sup> standard weeks. The highest mean incidence was recorded in H-1226. Whitefly population remained below economic threshold level (ETL) during 2008 while during 2009 it crossed ETL in RCH 134 BG-II (6.00-6.23 adults/leaf). Mean highest population was recorded in IT-905 <italic>Bt</italic> and RCH-134 BG-II. Leafhopper and whitefly population were significantly and positively correlated with temperature while negatively correlated with rainfall. Among the genotypes, it was observed that there was no significant difference in population of the sucking pests.

Influence of Abiotic Factors on Population Dynamics of Major Insect Pests of Mulberry

2015 ◽  
Vol 18 (5) ◽  
pp. 215-223 ◽  
Author(s):  
V.K. Rahmathull ◽  
K. Sathyanara ◽  
B.S. Angadi
Keyword(s):  
Population Dynamics ◽  
Insect Pests ◽  
Abiotic Factors

scholarly journals Effects of Sowing Date on Sunflower (Helianthus annuus) Damage by Pachnoda interrupta (Coleoptera: Scarabaeidae) and an Economic Threshold Levels for Its Management at Maiduguri, Sudan Savannah Ecological Zone of Nigeria

2013 ◽  
Vol 2 (3) ◽  
pp. 1
Author(s):  
Abdullahi G ◽  
B. M. Sastawa ◽  
Shehu A
Keyword(s):  
Yield Loss ◽  
Insect Pests ◽  
Cost Benefit ◽  
Threshold Level ◽  
Sowing Date ◽  
Planting Date ◽  
Control Measures ◽  
Economic Threshold ◽  
Pachnoda Interrupta ◽  
Cost Benefit Ratio

<em>Pachnoda interrupta</em> is one of the head-infesting insect pests of sunflower in Maiduguri. Two separate field experiment(one each for sowing date effect and threshold level) were conducted to investigate the influence of sowing date on damage and yield loss by <em>P. interrupta</em> on sunflower and the economic threshold level for its control in Maiduguri. The result for influence of sowing date experiment shows that percentage incidence of infestation was highly significant on sunflower sown on the 5<sup>th</sup> July than other planting date except that of 26<sup>th</sup> July. Significantly lower damage was recorded on sunflower sown on 19<sup>th</sup> July than those on the 5<sup>th</sup> and grain yield loss was also significantly higher on 26<sup>th</sup> July sowings than all other dates. The results for economic threshold level experiment indicated that 2.38 and 2.36 beetles/head were the economic threshold level for flowing and milky grain stage respectively and there was a 1:4.9 cost: benefit ratio/ ha. This means that there is a 20% return for every unit of inputs. The result implies that 19<sup>th</sup> of July is the best planting date to reduce infestations, damage and yield loss from <em>P. interrupta</em> in Maiduguri and artificial control measures should be initiated when there are 1.9 to 2.0 beetles/plant.

scholarly journals Plant age, crop stage and surrounding habitats: their impact on sucking pests and predators complex in cotton (Gossypium hirsutum L.) field plots in arid climate at district Layyah, Punjab, Pakistan

2022 ◽  
Vol 82 ◽  
Author(s):  
A. Nadeem ◽  
H. M. Tahir ◽  
A. A. Khan
Keyword(s):  
Insect Pests ◽  
Abiotic Factors ◽  
Threshold Level ◽  
Plant Age ◽  
Cotton Field ◽  
Strong Positive Correlation ◽  
Green Lacewings ◽  
Arthropod Predators ◽  
Trap Cropping ◽  
Field Plots

Abstract Sucking pests are major threat to cotton field crop which cause unbearable losses to the crop yield. Aim of the current study was to record seasonal dynamics of major sucking insect pests including whitefly, jassid, thrips and their natural arthropod predators i.e. green lacewings and spiders in cotton field plots. The effects of surrounding field crops on pests’ density and predatory efficiency of predators were also recorded. For sampling and survey of insects, the visual counting was found to be the most efficient method for recording the abundance of insects, trailed by net sweeping and tapping. Whitefly was the most dominant sucking pest found on the vegetative stage of cotton, followed by jassid and thrips. Fluctuated populations of predatory arthropods, spiders and green lacewings were also recorded during whole cropping season however, the densities of pests and predators varied with crop phenology. Spiders’ population was encouraging at both vegetative and flowering stage and also the same trend of jassid and whitefly were observed at both stages of the crop. Surrounding habitats showed non-significant effect on population densities of insect pests and predators. For abiotic factors, the spiders showed strong positive correlation with humidity and temperature. However, green lacewing was only positively correlated with humidity. On the other hand, the populations of whitefly, jassid and thrips showed non-significant correlation with both temperature and humidity. Overall densities of sucking insect pests were found above economic threshold level. The plant age, crop stage and surrounding habitats effect on the population fluctuation of pests as well as the predators’ abundance. The future studies are also warranted to investigate the altered habitats and multiple trap cropping to find out their impact on unattended insect predators and parasitoids in cotton crop.

scholarly journals Participatory analysis and evaluation of IPM practices against sucking pests of Bt cotton

2020 ◽  
Vol 1 (2) ◽  
pp. 79-81
Author(s):  
Shakti Khajuria ◽  
◽  
A.K. Rai ◽  
B.S. Khadda ◽  
Raj Kumar ◽  
...  
Keyword(s):  
Insect Pests ◽  
Aphis Gossypii ◽  
Threshold Level ◽  
Bt Cotton ◽  
Cotton Yield ◽  
Spray Application ◽  
Seed Cotton ◽  
Analysis And Evaluation ◽  
Leaf Hopper ◽  
Participatory Analysis

Farmer’s participatory demonstrations were evaluated during kharif seasons of 2017-2018 and 2018-2019 at four villages of Panchmahal district, Gujarat to introduce IPM practice and to evaluate their effectiveness through demonstrations. Farmers identified several constraints of which, increased infestation of sucking insect pests viz., aphid (Aphis gossypii Glover), leaf hopper (Amrasca biguttula biguttula Ishida) and whitefly (Bemisia tabaci Gennadius) were the most important. IPM practice consisting of one spray application of Beauveria bassiana (2 x 108cfu) @ 4 g /l water, two spray applications of thiamethoxam 25 WG @ 0.01 per cent (0.4 g /l water) and one spray application of acephate 75 SP @ 0.075 per cent (1 g /l water) following threshold level (5 sucking pests /leaf) was found effective and economical for the management of sucking insect pests without any adverse effect on the natural enemies in Bt cotton. The application of this practice also resulted higher seed cotton yield as compared to farmers practice.

scholarly journals Performances of Three Cotton Varieties Cultivated under Economic Threshold Level Based Insecticide Sprayed and Non-Sprayed Conditions

Our Nature ◽  
1970 ◽  
Vol 9 (1) ◽  
pp. 21-25
Author(s):  
H.M.S. Azad ◽  
M.R. Amin ◽  
D.A. Tithi ◽  
S.M.A. Hossain
Keyword(s):  
Seed Germination ◽  
Threshold Level ◽  
Germination Percentage ◽  
Commercial Production ◽  
Economic Threshold ◽  
Experimental Conditions ◽  
Significant Difference ◽  
Seed Index

Cotton growers of Bangladesh usually cultivate eleven varieties of cotton and abruptly use chemical insecticides for controlling pests. In this study we evaluated the performances of three extensively cultivated varieties (CB9, CB10 and SR05) under economic threshold level (ETL) based insecticide sprayed and non-sprayed conditions. Results showed that number of bolls per plant and yield of the varieties differ significantly and there was found significant difference between the experimental conditions. Our study showed that the variety SR05 produced significantly higher number of bolls (40.5±6.6 /plant) and yield (2498.3±18.9 kg/ha) compared to CB9 and CB10, whereas CB9 produced higher number of seed (36.9±3.7/boll) and seed index (83.4±0.9 g/100 seed) under ETL based insecticide sprayed condition. The ginning out tern (GOT%) and seed germination percentage of the studied varieties did not differ to a significant level. Overall fitness of the varieties indicated that SR05 possesses comparatively better performances for commercial production of cotton in Bangladesh.DOI: http://dx.doi.org/10.3126/on.v9i1.5728

Impact of Plant Spacing and Abiotic Factors on Population Dynamics of Sucking Insect Pests of Cotton

2006 ◽  
Vol 9 (7) ◽  
pp. 1364-1369 ◽  
Author(s):  
Muhammad Jalal Arif ◽  
Muhammad Dildar Gogi . ◽  
Mansoor Mirza . ◽  
Khuram Zia . ◽  
Faisal Hafeez .
Keyword(s):  
Population Dynamics ◽  
Insect Pests ◽  
Abiotic Factors ◽  
Plant Spacing
Sign in / Sign up

Export Citation Format

Share Document