Insecticidal potential of some plant extracts in nano and normal form on immatures stages of red palm weevil Rhynchophorus ferrugineus

Abstract

Red palm weevil, R. ferrugineus (Coleoptera: Dryophthoridae) is the principal insect pest attacks date palm all over Egypt, Current work aims to take advantage of effective, ecofriendly, and safer plant sources in pest control. Toxicity of some plant crude extracts on both normal and nano form against eggs and larvae stags of RPW was assessed in laboratory exposure experiments. The treatments comprised three different concentration of plant extracts (5, 10 and 15 mg/100 ml) for both normal and nano extracts of selected plants using aquatic solutions. Data showed that all the evaluated extracts showed potential ovicidal and larvicidal activity against RPW, nano extracts recorded the highest ovicidal and larvicidal activities compared to normal extract, as ovicidal potential eucalyptus nano extract at 15% was the most toxic which give (80.00±1.00%) mortality, (LC50=9.011) followed by oleander nano extract at 15% 76.67±0.58% (LC50=9.48) and Datura extract at 15 (70.0±1.0 %) (LC50=9.652), while, in Larvicidal activity, nano eucalyptus was the highest effect among all extraction (LC50=5.228) followed by Oleander(LC50=6.042).