Emigration Activity in Lesser Grain-Borer Rhyzopertha dominica in the Initial Stage of Infesting Stored Wheat Grain (Coleoptera: Bostrichidae)

2012 ◽  
Vol 34 (1-2) ◽  
pp. 91-96
Author(s):  
Małgorzata Kłyś
Keyword(s):  
Rhyzopertha Dominica ◽  
Wheat Grain ◽  
Lesser Grain Borer ◽  
Stored Wheat ◽  
Initial Stage

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 Plant powders protect stored wheat from infestation by lesser grain borer Rhyzopertha dominica (fabricius) (Bostrichidae: Coleoptera)

Agro-Science ◽  
2021 ◽  
Vol 20 (2) ◽  
pp. 42-48
Author(s):  
H.E. Negbenebor ◽  
W.A. Makanjuola ◽  
S. Nura
Keyword(s):  
Insect Pest ◽  
High Rate ◽  
Rhyzopertha Dominica ◽  
Lesser Grain Borer ◽  
Wheat Grains ◽  
Stored Wheat ◽  
Grain Damage ◽  
Plant Powders ◽  
Significant Difference ◽  
Synthetic Pesticides

Rhyzopertha dominica (Bostrichidae: Coleoptera) is one of the most serious devastating insect pests attacking stored wheat grains in Nigeria. The most common strategy adopted in controlling this insect pest is the application of synthetic pesticides which is costly, toxic to non-target organisms and is non eco-friendly. Botanical pesticides are recently used as alternatives to synthetic pesticides due to their non-hazardous effect on the environment and non-target organisms, cost effectiveness and direct impacts on the target organisms. This study was carried out to determine the toxicity of leaf powders obtained from three species of plants: Ageratum conyzoides, Momordica charantia and Tephrosia vogelii in the control of R. dominica infestation on stored wheat grains. Five doses (0.50, 1.00, 2.00, 4.00 and 8.00 g) per 20.00 g were measured from the powdered leaves of the tested plants with ethanol treatment as the control (0.00 g 20.00 g-1). The powdered doses were applied onto wheat grains before the insects were introduced. The experiment was laid down in completely randomized design (CRD) with three replications. The data obtained was analyzed using analysis of variance at 5% probability level with Least Significant Difference used to separate the means. The results showed significant (p ≤ 0.05) differences in the magnitude of toxicity imparted by various doses of the powders on R. dominica. The treatments influence high rate of mortality, reduced number of laid eggs and emerged adults when compared with the control. The toxicity of the powders increased with increase in dosage. It was concluded that 8.00 g 20.00 g-1 of the powders were more toxic to R. dominica, inducing 28.00-77.30% insects’ mortality thereby protecting grain damage to as low as 1.04% at 6th month of storage. T. vogelii leaf powders were recommended for use against R. dominica in stored wheat grains. Key words: botanicals, dose, lesser grain borer, wheat

Volatile organic compounds associated with postharvest fungi detected in stored wheat grain

2017 ◽  
Vol 46 (5) ◽  
pp. 483-492
Author(s):  
E. H. Barkat ◽  
B. Du ◽  
Y. Ren ◽  
G. E. St J. Hardy ◽  
Kirsty L. Bayliss
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Wheat Grain ◽  
Stored Wheat ◽  
Volatile Organic
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