Non-preference for oviposition and damage intensity on soybean genotypes by Bemisia tabaci

Abstract

Bemisia tabaci is one of the economically important pests of many cultivated plant. This pest also plays as a virus vector that causes high yield losses. The objective of this study was to determine non-preference for oviposition in soybean genotypes to B. tabaci and the damage intensity caused by this pest. The experiment was conducted in Indonesian Legumes and Tuber Crops Research Institute in 2018. 11 soybean genotypes were evaluated in screen house using randomized block design with three replicates by free-choice method. The result showed that the population of egg and adult B. tabaci was not significantly different between genotypes. However, the population of nimph and leaf disease intensity was significantly affected by genotypes. The average number of nymph was 44.4 individuals/pot with the highest population was found on G1000H/9305//IAC100-271///Grob-36-2 (114 individuals/pot) and the lowest was found on Kaba/IAC100//Brg63///Grob-392-1 (7.3 individuals/pot). Moreover, the leaf damaged intensity ranged from 8.6-33.4%/pot (average of 24.6%/pot). Based on oviposition preference indicated by nymph population, and leaf damaged intensity, there were three promising lines (Kaba/IAC100//Brg63///Grob-386-1, Kaba/IAC100//Brg63///Grob-392-1, and Gema) showed consistently resistant with intermediate level against B. tabaci. These three have same response with G100H. Therefore, Kaba/IAC100//Brg63///Grob-386-1 and Kaba/IAC100//Brg63///Grob-392-1 was considered to be released as superior variety and further in concert with Gema could be potential as gene source for improving the resistance against B. tabaci.