Characterization of peanut cultivars to damage Stegasta bosquella (Chambers, 1875) (Lepidoptera: Gelechiidae)

ABSTRACT: We evaluated the strength of four growth habit of peanut cultivars creeping and five cultivars of erect growth habit to damage Stegasta bosquella (Chambers, 1875) (Lepidoptera: Gelechiidae) under field conditions during the rainy season, in the years 2009/2010 and 2010/2011. The cultivars used in the experiments were: IAC 147, IAC 213, IAC Caiapó and IAC Runner 886 (runner) and IAC Tatu ST, IAC 5, IAC 8112, IAC 22 e IAC 88-1 (erect). The design adopted was randomized blocks with split plot over time, and four replications. For infestation of S. bosquella , weekly evaluations were done 18 to 67 days after emergence (DAE), with caterpillars count and damage assessments. For counting the number of shoots per plant, they collected up five plants per plot from the 30, 60 and 90 DAE. Regardless of cultivating major infestations of S. bosquella occur from 53 to 67 DAE. The IAC Runner 886 cultivar has the highest emission apical shoots a desirable feature in plant defense in relation to S. bosquella .

摘要：本研究于2009/2010及2010/2011两个雨季的田间条件下，评估了4个匍匐型花生品种与5个直立型花生品种对斯氏麦蛾（Stegasta bosquella (Chambers, 1875)，鳞翅目：麦蛾科Gelechiidae）为害的抗性水平。本试验所用品种包括：匍匐型品种IAC 147、IAC 213、IAC Caiapó及IAC Runner 886，以及直立型品种IAC Tatu ST、IAC 5、IAC 8112、IAC 22与IAC 88-1。试验采用裂区随机区组设计，以时间为裂区因子，设置4次重复。针对斯氏麦蛾的侵染为害，分别于出苗后18~67天（DAE，Days After Emergence）每周开展1次调查，记录幼虫数量并评估为害程度；为统计单株分枝数，分别于出苗后30、60、90天，每个小区采集至多5株植株进行测定。无论品种类型如何，斯氏麦蛾的主要为害发生期均为出苗后53~67天。其中IAC Runner 886品种的顶端分枝萌发能力最强，该性状在抵御斯氏麦蛾为害中属于优良植株防御特性。