Kaffir lime, Citrus hystrix as a potential botanical insecticide to control the diamondback moth, Plutella xylostella
2007
Loh Siew Fan | Rita Muhamad, Universiti Putra Malaysia, 43400 UPM Serdang D.E. (Malaysia). Dept. of Plant Protection
Botanical insecticides either derived from natural plant parts or purified insecticidal compounds that are isolated from such plants become a promising agricultural pest control agent at present, and probably in the future. Environmental and health issues have led us to replace synthetic chemical insecticides with natural plant products. It is urgently needed for successful pest management, especially in crucifers which are the most common vegetable in the Asian diet. This study was conducted to examine the effect of C. hystrix dried leaves and fruit peels extract with ethanol on P. xylostella mortality. Four concentrations of 10%, 20%, 30% and 40% were tested using permethrin and neemix as comparisons with distilled water as control. Ten third instar diamondback moth larvae were placed on the cabbage leaf treated with 1 ml extract solution in petri dishes. Larval mortality was recorded every 24 hours for 3 days. Analysis of data was carried out by using analysis of variance (ANOVA), the Statistical Analysis System (SAS). Means were separated and compared by using Turkey Studentized Range (HSD). Kaffir lime leaves extract have slightly higher insecticidal properties as compared to the fruit peels extract. Their toxicity may be as good as compared to Neemix at high concentration (30% and 40%). However, both the crude extracts had significant lower toxicity when compared with the commercial pyrethroid insecticide,Permethrin. Both of the leaves and peels extract could be used as a potential botanical insecticide because of their repellent and antifeedant properties. Further study on the mode of action, mechanisms reaction, effectiveness timing and stability of the crude extracts may be required.
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