Antixenotic and antibiotic impact of synthetic and plant extracted chemicals against Rhyzopertha dominica (Fabricius) (Coleoptera: Bostrichidae) at different storage periods in stored wheat

Muhammad Nawaz Khan, Naima Din, Muhammad Babar Shahzad Afzal, Misbah Ashraf, Ummara Khan, Zafar Iqbal, Faisal Hayat and Malik Abdul Rehman

ABSTRACT    Lesser grain borer, Rhyzopertha dominica (Fabricius) (Coleoptera: Bostrichidae) is a major pest of stored products. A research work was conducted to evaluate the efficacy of the two pyrethroids i.e. deltamethrin, and cypermethrin @ 2.5 ml/liter and three botanicals, i.e. leaf extracts of Azadirachta indica, Moringa oleifera and seed extract of Datura stramonium @ 5% concentration by dipping the jute sacks into their solutions (50 ml solution per bag) to check the repellant action of these chemicals against the R. dominica in wheat stored for four storage intervals (15, 30, 45, and 60 days). Different treatments of the chemicals tested, and storage periods showed a significant effect on the penetration of insects into the bags and mortality of insects. Degree of antixenosis and antibiosis showed a negative correlation with the storage periods. Among the two pyrethroids and three botanicals, deltamethrin and cypermethrin conferred an effective control of the target insects for one month which lessened gradually in the second month. Maximum antixenosis of 62.13% and 61.63% were shown due to application of deltamethrin and cypermethrin, respectively at 15 days of the storage interval, while a minimum of 49.60% and 49.71%, respectively were shown due to same treatments at 90 days of the storage period. Similarly, the decreasing order of antixenosis percentage (non-preference) against botanicals at 15 days interval was 40.04%>35.17%>28.31% against D. stramonium, A. indica and M. oleifera, respectively. The application of deltamethrin and cypermethrin induced maximum antibiosis of 94.83% and 94.86%, respectively against R. dominica after 15 days of storage period as compared to botanicals and control treatment. © 2020 Department of Agricultural Sciences, AIOU

Keywords: Antibiosis, Antixenosis, Chemicals, Rhyzopertha dominica, Storage, Wheat

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