The use of botanical insecticides obtained from local plants to control cabbage leaf webber (Crocidolomia binotalis) zeller on cabbage plants

Abstract

Sustainable agriculture emphasizes the use of botanical insecticides obtained from local plants to control cabbage leaf webber, Crocidolomia binotalis Zeller on cabbage plants. The objective of this study was to assess several species of plants for their ability in controlling this destructive pest. The research was conducted at Experimental Garden in Berastagi, from April to September 2017. It was designed using Randomized Block Design (RBD) non-Factorial consisting of 10 treatments with 3 (three) replications. The results revealed that the application of leaf crude extracts of thornapple (Datura metel) + tephrosia (Tephrosia vogelii) + galangal rhizome (Alpinia galanga) (1:1:1) at concentration 20% (E) was more effective in controlling this caterpillar compared to the use of chemical insecticides. The highest average of cabbage production was found in the plants treated with leaf crude extracts of thornapple + tephrosia + galangal rhizome (1:1:1) at concentration 10% (2.85 kg/plot).