scholarly journals An Appraisal of Insect Pests Associated with Cereal Grains Traded in Maiduguri, Borno State, Nigeria

2014 ◽  
Vol 19 ◽  
pp. 76-83
Author(s):  
D.M. Mailafiya ◽  
Z. Dauda ◽  
M.M. Degri ◽  
B.G.J. Kabir ◽  
Y.T. Maina
Keyword(s):  
Insect Pests ◽  
Insect Pest ◽  
Sitophilus Oryzae ◽  
Rhyzopertha Dominica ◽  
Wheat Grains ◽  
Pest Infestation ◽  
Randomized Design ◽  
Cereal Grain ◽  
The Mean ◽  
Completely Randomized Design

This study investigated insect pest infestation of maize, millet, sorghum, rice and wheat grains traded in the three main markets namely Monday, Baga-Road and Custom-Park markets in Maiduguri, Borno state, Nigeria. Sampling lasted from January to June 2012. Samples per grain type, each weighing one kilogram, were obtained every two weeks from ten randomly selected traders per market. Each sample was sieved in the laboratory to recover all adult insects present, both at sampling and also after one month stay (laid out in a completely randomized design). In each market, Sitophilus zeamais Motschulsky and Rhyzopertha dominica (F.) followed by Tribolium castaneum Herbst, Sitophilus oryzae (Linnaeus), Trogoderma granarium (Everts) or Cryptolestes sp. were the insect pests commonly found attacking more (between two to five) grain types. Observed highest and lowest mean insect numbers were respectively by S. zeamais in maize grains (12.13 individuals in Monday market) and T. granarium in wheat grains (0.13 individuals in Baga-Road market). Results unveil that among three markets, higher mean total numbers of insects were present in maize, rice or wheat (18-33). For all grain types, the mean numbers of damaged grains were significantly higher in Monday (53-357) and Custom-Park (46-302) than in Baga-Road (17-109) markets. Furthermore, the mean total number of damaged grains across markets was significantly higher maize, followed by rice and wheat (55-231) than in other grain types (37-41). The implications of all these results on insect infestation of different cereal grain types sold in these markets are discussed.

scholarly journals Survey of insects and Mites Associated with Stored Rice in Nigeria

2021 ◽  
Vol 4 (1) ◽  
pp. 194-201
Author(s):  
IB Ezeobiora ◽  
KA Kemabonta ◽  
WA Makanjuola
Keyword(s):  
Species Composition ◽  
Pest Management ◽  
Insect Pests ◽  
Insect Pest ◽  
Sitophilus Oryzae ◽  
Mite Species ◽  
Insect Species ◽  
Rhyzopertha Dominica ◽  
Percentage Occurrence ◽  
Rice Samples

Insect pest infestation causes quantitative or qualitative losses in stored Rice. Proper identification of the insect species infesting stored Rice is critical for making pest management decisions. This study assesses the species composition and abundance of insect pests of stored Rice in Nigeria. Imported and Local Rice samples each weighing one kilogram were obtained every 6 months from three randomly selected vendors in randomly selected markets in 14 towns in 14 states in Nigeria. 50g were weighed from each sample and kept in vials, covered, strapped with rubber band and kept in the laboratory. The Rice samples were sieved to collect all adult insects present after Six months in storage. Sampling lasted for two years (2016-2017). There were 11 species of insect pests and one Mite species in the stored Imported and Local Rice samples. Most of the species were from the order Coleoptera with the percentage occurrence of 80.9% in Imported Rice and 82% in Local Rice. The insect species composition includes Sitophilus oryzae, Cryptolestes ferrugineus, Sitophilus zeamais, Psocids, Sitotroga cerealella, Ahasverus advena, Tribolium castaneum Oryzeaphilus surinamensis, Oryzaephilus mercator and Rhyzopertha dominica. The Psocid and mite species could not be identified. Sitophilus oryzae was the main insect pest of Rice with the percentage occurrence of 39.23% in Imported Rice and 26.87% in Local Rice. The outcome of this study is very important in planning control measures as the knowledge of the species composition and abundance of insect pests is an important component of pest management in stored Rice in Nigeria.

scholarly journals Insect pests in stored grain: a Canterbury example

2017 ◽  
Vol 70 ◽  
pp. 319
Author(s):  
J.B. Drummond ◽  
J.W.M. Marris ◽  
T. Brooker
Keyword(s):  
Insect Pests ◽  
Insect Pest ◽  
Sampling Bias ◽  
Survey Sampling ◽  
Preliminary Survey ◽  
Insect Infestation ◽  
Stored Grain ◽  
Pest Infestation ◽  
Cereal Grain ◽  
Storage Facilities

Grain samples were collected from storage facilities of cereal grain producers throughout Canterbury, New Zealand to determine levels of insect pest infestation. Collection followed a preliminary survey in 2015/16 where growers were invited to submit grain samples. It was possible that producers were more likely to send samples if they suspected insect infestation. To eliminate any survey sampling bias in the 2016/17 survey, 42 cereal grain producers were randomly selected. Fifty-eight grain samples were collected from 42 storage facilities, of which 77% were infested with one or more insect species. These were predominantly Coleoptera and Psocoptera. The most frequently encountered beetle species were Orzyaephilis surinamensis and Cryptolestes species. In contrast to the 2015/16 survey, a Sitophilus (weevil) species was recorded for the rst time. The proportion of storage facilities infested by insects (77%) was similar to the 2015/16 survey (73%) but higher than two previous surveys in 1971 (38%) and 1979 (50—63%). The proportion of storage facilities treated with insecticides (79%) was similar to the 1979 survey (83%) but greater than the preliminary 2015/16 survey (62%). Results indicate that insect pests of stored grain remain a signi cant risk for grain producers.

scholarly journals Could biorational insecticides be used in the management of aflatoxigenicAspergillus parasiticusand its insect vectors in stored wheat?

PeerJ ◽  
2016 ◽  
Vol 4 ◽  
pp. e1665 ◽  
Author(s):  
Tiyyabah Khan ◽  
Ahmad Ali Shahid ◽  
Hafiz Azhar Ali Khan
Keyword(s):  
Survival Rate ◽  
Insect Pests ◽  
Fungal Spores ◽  
Sitophilus Oryzae ◽  
Aflatoxin Production ◽  
Rhyzopertha Dominica ◽  
Wheat Grains ◽  
Stored Wheat ◽  
Moisture Contents ◽  
Subsequent Effect

Insect pests in stored wheat cause significant losses and play an important role in the dispersal of viable fungal spores of various species including aflatoxin producingAspergillus parasiticus. The problem of insecticide resistance in stored insects and environmental hazards associated with fumigants and conventional grain protectants underscore the need to explore reduced risk insecticides to control stored insects with the ultimate effect on aflatoxin production. The purpose of this study was to investigate the insecticidal potential of four biorational insecticides: spinosad, thiamethoxam, imidacloprid and indoxacarb, on wheat grains artificially infested withRhyzopertha dominica/Sitophilus oryzaeand/orA. parasiticusspores, and the subsequent effect on aflatoxin production. Spinosad and thiamethoxam were the most effective insecticides againstR. dominicacompared toS. oryzaefollowed by imidacloprid. Spinosad applied at 0.25–1 ppm and thiamethoxam at 2 and 4 ppm concentrations resulted in complete mortality ofR. dominica. However, indoxacarb was more toxic againstS. oryzaecompared toR. dominica. Wheat grains inoculated withR. dominica/S. oryzae+spores elicited higher aflatoxin levels than wheat grains inoculated with or without insecticide+spores. In all the treatment combinations containing insects, aflatoxin production was dependent on insects’ survival rate. In addition, thiamethoxam and imidacloprid had also a significant direct effect on reducing aflatoxin production. Aflatoxin levels were lower in the treatment combinations with any concentration of thiamethoxam/imidacloprid+spores as compared to wheat grains inoculated with spores only. Correlation analyses revealed highly significant and positive association between moisture contents/insect survival rate and production of aflatoxin levels, and insect survival rate and moisture contents of the wheat grains. In conclusion, the results of the present study provide baseline data on the use of biorational insecticides againstR. dominicaandS. oryzaeand subsequent effect on aflatoxin production.

scholarly journals The Status of Insect Pests Prevailing in Stored Wheat Grain under Traditional Storages of Cheha District of Gurage Zone of South Central Ethiopia

2020 ◽  
pp. 1-7
Author(s):  
Tsehaynew Wubetu ◽  
Berhanu Hiruy
Keyword(s):  
Insect Pests ◽  
Sitophilus Oryzae ◽  
Rhyzopertha Dominica ◽  
Southern Ethiopia ◽  
Wheat Grain ◽  
Wheat Grains ◽  
Central Ethiopia ◽  
Stored Wheat ◽  
South Central ◽  
The Status

Aim: To assess the status of the insect pests of stored wheat grains in Cheha destrict of Gurage Zone of Southern Ethiopia. Study Design: Peasant associations were selected purposefully based on intensity of wheat production, such that those peasant association growing wheat predominantly were selected for the survey, while villages, representative farmers and their storage systems were selected randomly using a nested design. Place and Duration of Study: Survey was conducted between 1, July to 30, December 2019 with the interval of one month in major wheat growing peasant associations of Cheha district of south central Ethiopia. Methodology: The assessment on abundance was made from of half kilogram of wheat grain sample taken from 135 randomly selected farmer’s storages of three peasant associations using taxonomic keys of books related to stored product insects. Results: Eight major species of insect pests consisting of four primary pests and four secondary pests belonging to five families with in two insect orders were documented. Of these pests recorded, Sitophilus oryzae, Sitophilus zeamais, Sitotroga cereallella, Tribolium castaneum and Tribolium confusum, respectively were the most prevalent and frequently occurring as they appeared between 12.74 and 33.78 individuals per 100 g of grain and as they occurred in the range between 77.78 and 92.26% per 100 g of sample wheat grain collected from the survey sites, respectively. These were followed by Cryptolestes ferrugineus, Cryptolestes pusillus and Rhyzopertha dominica which occurred between 7.26 and 10.74 individuals per 100 g of grain and in ranges between 51.85 and 66.67% per 100 g of sample wheat grain collected. Conclusion: The traditional methods and practices used by farmers were inefficient for sufficient wheat grains protection against insect pests in storages; this implies for the urgent need for designing management strategies for more effective and sustainable methods of control.

scholarly journals Comparative Experimental Effects of Intercropping and Cypermethrin on Insect Pest Infestation and Yield of Maize, Cowpea and Okra in Two Cameroonian Agro-Ecological Zones

2021 ◽  
Vol 3 (2) ◽  
pp. 383-393
Author(s):  
Patient Farsia Djidjonri ◽  
Nukenine Elias Nchiwan ◽  
Hartmut Koehler
Keyword(s):  
Field Experiments ◽  
Insect Pests ◽  
Cropping Systems ◽  
Insect Pest ◽  
Maize Yield ◽  
Ecological Zones ◽  
Pest Infestation ◽  
Final Yield ◽  
Cropping Seasons ◽  
Agro Ecological Zones

The present study investigates the effect of intercropping (maize-cowpea, maize-okra, maize-okra-cowpea, okra-cowpea) compared to insecticide application on the level of infestation of insect pests and the final yield of maize, cowpea and okra. Field experiments were conducted during the 2016 and 2017 cropping seasons in the Guinean Savannah (Dang-Ngaoundere) and Sudano Sahelian (Gouna-Garoua) agro-ecological zones in Cameroon. Our experimental design was a split plot arrangement in a randomized complete block with four replications. The main factor was assigned to the use of insecticide (Cypermethrin) and sub plots were devoted for cropping systems. We compared the efficiency of intercropping to that of Cypermethrin application on the Yield of maize, cowpea and okra as influenced by insect pest damages. The comparison of monocropped sprayed by Cypermethrin to unsprayed showed that, in Dang, insect pests reduced maize yield by 37% and 24% in 2016 and 2017, respectively, whereas in Gouna, it was lower than 8% during the both years. Reduction in seed yield by insect pests on cowpea in Dang represented 47% and 50% in 2016 and 2017, respectively, whereas in Gouna, it was 55% and 63% in 2016 and 2017, respectively. For okra, insect pests reduced okra fruit yield by 25% and 44% in Dang and 23% and 28% in Gouna, respectively, in 2016 and 2017. Crop yield was lower in intercropping compared to monoculture due to competition of plants in association on different resources. Considering the total yields obtained from each intercropping, intercropping trials resulted generally in higher yields compared to mono-culture (LER > 1) in both sites and years but the respective yields were quite different. On the basis of the results obtained, we recommend maize-cowpea intercropping as a sustainable solution to reduce the infestation level of their pest insects.

scholarly journals Еffect of insect infestation on the economic value of smoked fish sold in selected markets in Nigeria

2020 ◽  
Vol 12 (1) ◽  
pp. 82-86
Author(s):  
A.A. Ayeloja ◽  
F.O.A. George ◽  
W.A. Jimoh ◽  
G.L. Adebisi
Keyword(s):  
Insect Pests ◽  
Insect Pest ◽  
Economic Value ◽  
Sampling Technique ◽  
Economic Loss ◽  
Insect Infestation ◽  
Chi Square ◽  
Smoked Fish ◽  
Pest Infestation ◽  
Multistage Sampling

Abstract. In the present study a multistage sampling technique using semi-structured questionnaire was used to obtain information on socio- economic characteristics of the respondents and on economic loss of smoked fish resulting from insect pest infestation. Smoked fishes were bought from 10 markets in Oyo state, South West of Nigeria and checked in the laboratory for the insect pests. Data were analyzed using descriptive statistics and Chi-square. Results indicated that insects at their larvae stage cause more economic loss to smoked fish than adult insects while Necrobia rufipes and Dermestes spp. are the insects found to infest the smoked fishes in this study. The insect infestation of the smoked fish leads to huge economic loss. Of all respondent groups the women dominate smoked fish business.

scholarly journals Electrophysiological and Behavioral Responses ofTheocolax elegans(Westwood) (Hymenoptera: Pteromalidae) to Cereal Grain Volatiles

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Giacinto Salvatore Germinara ◽  
Antonio De Cristofaro ◽  
Giuseppe Rotundo
Keyword(s):  
Insect Pests ◽  
Petri Dish ◽  
Wheat Grains ◽  
Olfactory Responses ◽  
Cereal Grain ◽  
Host Habitat ◽  
Hexane Extracts ◽  
Electroantennogram Recordings ◽  
Host Habitat Location ◽  
Different Doses

Volatiles emitted by the host’s food would be the first signals used by parasitoids in the host location process and are thought to play an important role in host habitat location. In this study, the olfactory responses ofTheocolax elegans(Westwood), a Pteromalid wasp that parasitizes immature stages of stored-product insect pests developing inside cereal or leguminous grains, to volatiles emitted by healthy wheat grains, their hexane extracts, and different doses of three individual compounds previously identified in cereal grain odors were investigated in Y-tube olfactometer and Petri dish arena behavioral bioassays and electroantennogram recordings. In Y-tube olfactometer bioassays, odors from healthy wheat grains and their hexane extracts were attractive to both sexes ofT. elegans. Moreover, hexane extracts elicited arresting effects in Petri dish arena. The three synthetic compounds valeraldehyde, maltol, and vanillin elicited dose-dependent responses in both male and female adult wasps confirming the capability of the peripheral olfactory systems to perceive cereal volatiles. In behavioral bioassays, different doses of vanillin were significantly attractive to both sexes.

Resistance levels of selected rice genotypes to Sitophilus oryzae L. and Rhyzopertha dominica F. infestations

2020 ◽  
Vol 17 ◽  
pp. 39-46
Author(s):  
S.K. Ajao ◽  
K.O. Popoola ◽  
S Mande ◽  
A Togola
Keyword(s):  
Insect Pests ◽  
Sitophilus Oryzae ◽  
Rhyzopertha Dominica ◽  
International Institute ◽  
Rice Varieties ◽  
Resistance Level ◽  
Susceptibility Index ◽  
Grain Damage ◽  
Rice Genotypes ◽  
Moderately Resistant

The need to screen new rice genotypes for resistance to stored product insect pests is important to boost production and availability of rice for food security. Therefore, thirteen rice genotypes and varieties included ten interspecific rice genotypes from two crossed parents Oryza sativa (WAB 56-104) and Oryza barthii (IRGC 106107), the two parents and NERICA8 variety were collected from Africa Rice Center, International Institute of Tropical Agriculture (IITA) Ibadan, to examine their resistance level to infestation by Sitophilus oryzae L. and Rhyzopertha dominica F. The resistance of the varieties were assessed by artificial infestation with 12 unsexed adults each in 10 g of the rice varieties in four replicates under laboratory conditions of 26 ± 2oC temperature and 75 ± 5% relative humidity in a completely randomized design. Number of adult insect emergent, per cent grain damage, percent weight loss of infested samples and index of susceptibility were determined. Correlation analysis between nutritional contents of the varieties and infestation variables were also obtained. Results indicate differential responses of the two insects on the rice genotypes/varieties. The O. barthii parent was resistant, while the O. sativa parent was moderately resistant using the susceptibility index. Of the ten rice genotypes, G4, G3, G1, G7, G2, G10 and G9 were resistant in descending order, while G5 and G6 were moderately resistant, whereas only G8 was susceptible. NERICA8 was also found to be susceptible to infestation. In addition, the resistant grains had lower ash content. Modification in genetic variations and nutritional contents of new rice varieties may be a critical factor in insect resistant genotype pro-grammes to reduce post-harvest losses incurred by farmers. Keywords: Rice resistant genotypes; Rhyzopertha dominica; Oryzae sativa; Oryzae barthii; Sitophilus oryzae; susceptibility index

scholarly journals The Insecticide Toxicity and Repelling Ability of Jeruk Purut (Citrus hystrix D.C) Leaf Extract on Maize Weevil (Sitophilus zeamais Motsch)

2019 ◽  
Vol 5 (1) ◽  
Author(s):  
Alfia Wulansari ◽  
Nur Rochman ◽  
Setyono Setyono
Keyword(s):  
Mortality Rate ◽  
Key Words ◽  
Leaf Extract ◽  
Insect Pest ◽  
Sitophilus Zeamais ◽  
Maize Weevil ◽  
Insecticide Toxicity ◽  
Randomized Design ◽  
Completely Randomized Design ◽  
Sitophilus Zeamais Motsch

Sitophilus zeamais Motsch. is a primary storage insect pest damaging maize grains. Control of S. zeamais can be done by applying biopesticide. This study was aimed at assessing the ability of Jeruk Purut leaf extract, as biopesticide, to kill and repel Sitophilus zeamais Motsch. The study was conducted at Entomology Laboratory, Seameo Biotrop in March to August 2018. A completely randomized design with three replicates in each rate of Jeruk Purut leaf extract was used. In preliminary pesticide toxicity experiment, five rates of Jeruk Purut leaf extract, namely 0%, 2%, 4%, 6%, and 8% were applied. In preliminary repelling ability experiment, five rates of Jeruk Purut leaf extract, namely 1%, 2%, 4%, 6%, and 8% were applied. In the main pesticide toxicity and repelling ability trial, five rates of Jeruk Purut leaf extract, namely 3%, 6%, 9%, 12%, and 15% were applied. Results showed that in 24 hour after treating (HAT) no significant effects were found. Significant effects of Jeruk Purut leaf extract as insecticide on S. zeamais were found in 48 and 72 HAT. The highest mortality rate (82.2%) of S. zeamais was found in 15% rate of Jeruk Purut leaf extract in 72 HAT. The application of Jeruk Purut leaf extract was not found to give significant effects on repelling S. zeamais in 24, 48, and 72 HAT as indicated in their sharply fluctuating repellent values. The highest repelling ability (95%) was found in the application of 9% Jeruk Purut leaf extract in 24 HAT. It was concluded that Jeruk Purut leaf extract was more potential as insecticide repellent for Sitophilus zeamais Motsch. Key words: biopesticide, repellent, insecticide, maize, primary storage insect pest

scholarly journals ANATOMICAL STUDY OF MORINGA LEAF (MORINGA OLEIFERA LAM.) UNDER IRON FERTILIZATION

2020 ◽  
Vol 21 (supplement 1) ◽  
Author(s):  
Jawad Kadhim Obaid Al-Hujayri ◽  
Abdoun H. Alwan ◽  
Neepal Imtair Al-garaawi
Keyword(s):  
Moringa Oleifera ◽  
Foliar Application ◽  
Anatomical Study ◽  
Iron Mineral ◽  
Randomized Design ◽  
The Mean ◽  
Completely Randomized Design ◽  
Normal Epidermis ◽  
Different Levels ◽  
Moringa Oleifera Lam

The effect of different levels of nano- and mineral-Iron and their method of application on anatomical properties of the upper and lower epidermis of Moringa (Moringa oleifera Lam.) leaves was studied. Seeds of Moringa were sown in 15 kgs soil capacity pots during the growing season of 2018/2019 arranged as a factorial experiment within Completely Randomized Design, with three replicates. The factorswere a method of fertilization(soil or foliar application),three levels i.e. 0,180 and 360mg.l-1 of each of mineral and nano-Iron. The total number of experimental units was 2×3×3×3 for method, nano-Iron, mineral-Iron, and replicates respectively.The application method caused an increase in the mean dimensions of normal epidermis cells, stomatoes, and hairs.These traits were increased as Iron levels increased. Where 360 mg.l-1 of both types of Iron gave the highest dimensions. Soil application gave higher values of epidermis dimensions than that obtained from the foliar application. The number of stomatoesincreased with increasing the level of Iron. The number of normal epidermis cells was conversely proportioned with their volume.

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