Patogenisitas Entomopatogen Beauveria bassiana (Bals.) Vuill. Terhadap Larva Crocidolomia pavonana (F.) pada Tanaman Kubis (Brassica oleracea var. capitata) di Laboratorium

Abstract

Crocidolomia pavonana is an important pest on cabbage plants. The use of biological control agents such as the entomopathogenic fungus Beauveria bassiana is an alternative to control C. pavonana. This study aims to determine the pathogenicity of the entomopathogenic fungus B. bassiana with a certain density of conidia on the mortality of C. pavonana larvae based on LT₅₀ and LC₅₀ tests.This research was conducted in vitro using a completely randomized design (CRD). With a treatment level of 4 treatments and 3 replications. The number of samples per repetition is 10 larvae and the total sample in one treatment is 30 larvae. Treatment experiments used variations in concentration of B. bassiana conidia density, namely conidia density of 10⁸ conidia/ml (A), 10⁷ conidia/ml (B), 10⁶ conidia/ml (C), and Control (K). The pathogenicity of the entomopathogenic fungus B. bassiana can infect C. pavonana larvae from one day after application. The density concentration of 10⁸ conidia/ml is very good and can cause 100% mortality on the eighth day. The fastest LT₅₀ value was in the treatment with a density of 10⁸ conidia/ml, while the LC₅₀ value was found in a concentration with a density of 10⁸ conidia/ml.