Survival and development of eggplant fruit and shoot borer, Leucinodes orbonalis Guenee, reared continuously on Bt and non-Bt eggplants

Issue Date

10-2013

Abstract

A study was conducted to generate data on the survival and development of eggplant fruit and shoot borer (EFSB) collected and continuously reared in Bt and non Bt open-pollinated and hybrid varieties during the 2010-2012 field trials of Bt eggplant conducted in Los Banos, Laguna and Sta. Maria, Pangasinan. The larvae collected were transferred to cups individually and provided with freshly sliced eggplant fruits from the original host and brought to the CSC-IPB Entomology P2 Laboratory for observation. Higher incidence of EFSB infestation was recorded in Sta. Maria, Pangasinan than in Los Banos, Laguna. Significantly more larvae were collected from non-Bt open-pollinated and hybrid varieties compared with Bt varieties. A mean of 3.5 larvae were collected from the Bt hybrids comapared to 39.5 and 31.35 larvae from the non-Bt hybrid check variety and near isogenic lines, respectively. When reared continuously, only a mean of 1.16 individuals emerged as adults in Bt hybrids compared to 29 and 22.32 adults from the non-Bt hybrid check variety and near isogenic lines, respectively. The EFSB survival was also observed to be higher on non-Bt open-pollinated varieties compared to that on Bt OP variety. When adults that emerged from Bt and non Bt hosts were pair-mated (Bt x non-Bt), either no eggs was produced or the few eggs deposited were sterile. The results suggest that continuous feeding of EFSB on Bt hosts not only leads to mortality but also decreased reproductive fitness.

Source or Periodical Title

The Philippine Entomologist

ISSN

0048-3753

Volume

27

Issue

2

Page

211

Document Type

Article

Frequency

semi-annually

Language

English

En – AGROVOC descriptors

LEUCINODES ORBONALIS; SOLANUM MELONGENA; EGGPLANTS; BACILLUS THURINGIENSIS; DEVELOPMENTAL STAGES; REPRODUCTION

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