Compatibility studies of entomopathogenic fungi and botanical pesticide for controlling Spodoptera exigua

Abstract

Spodoptera exigua is one of main pest for horticulture crops. In sustainability agriculture, entomopathogenic like Beauveria bassiana and Metharizium anisopliae are solution to control this pest. This study aimed to examine the compatibility between the entomopathogenic fungus Beauveria bassiana and the vegetable insecticide neem leaf extract against the larvae of Spodoptera exigua. Value LC 50 single testing B. bassiana and neem leaf extract respectively is 0.08% (y=1,65x + 0.16) and 0.627% (y=1,59x-1.02). While the value of LC 50 treatment. combinations B. bassiana with neem leaf extract is 0.079% (y = 1,22x + 1.45). Based on the value of LC 50, it is known that the LC 50 value of the combination treatment is smaller than the LC 50 value of the single treatment, this indicates that the combination treatment has a higher toxicity than the combination treatment in killing S. exigua larvae. The LT 50 values from the LC 50 obtained from the single test of B. bassiana and neem leaf extract were 7.96 days and 6.1 days, respectively. While the value of LT 50 from LC 50 obtained from testing the combination of B. bassiana with neem leaf extract was 5.79 days. Based on the LT 50 value, it can be seen that the LT 50 value of the combination treatment is smaller than the LT 50 value of the single treatment.