Pengaruh Interval Waktu Aplikasi Beauveria bassiana dalam Mengendalikan Hama Spodoptera frugiperda pada Tanaman Jagung

Abstract

Spodoptera frugiperda is a harmful pest on maize. These larvae damage shoots, young leaves or plant growth points. B. bassiana is a biological agent that has been shown to be able to effectively control S. frugiperda. This research was carried out in two stages, namely the first stage of research carried out at the Plant Protection Laboratory and the second stage at the Jember State Polytechnic Land. The purpose of the first stage is to determine the reference concentration in the field based on mortality and insecticide efficacy tests. The second stage aims to observe the intensity of S. frugiperda attack on corn plants with spraying time intervals of once in 2 days in block 1 and every 5 days in block 2 and observe the weight of cobs and dry shells per sample. The first stage of data analysis used a completely randomized design with 5 treatments and repeated 6 times. Further test using the smallest Significant Difference (BNT) 5%. The second stage of data analysis was the intensity of attack at 2 and 5 days application time interval and the weight of wet and dry shelled cobs using the Mann Whitney non-parametric analysis test. Based on the results of further tests, the efficacy of the insecticide B. bassiana to control the 3rd instar armyworm was 15ml/L and became the reference concentration in the field. With the application of once every 2 days the intensity of S. frugiperda attacks before the application of B. bassiana is 7% and after the application is 3%. Then with the application of B. bassiana once every 5 days the intensity of S. frugiperda attacks before the application is 3% and after the application is 1%. The average weight of wet cobs per sample for blocks 1 and 2 were 248 and 237 grams, respectively. The average dry shell weight per sample in block 1 and block 2 was 150.62 and 167 grams, respectively.