《Table 2 Resistance rating of six improved maize varieties using mean score of damage parameters》

  提示：宽带有限、当前游客访问压缩模式

本系列图表出处文件名：随高清版一同展现

《Laboratory Assessment of Susceptibility of Maize Varieties to Post-harvest Infestation By Sitophilus zeamais(Mostchulsky)(Coleoptera: Curculionidae)》

1. 获取 高清版本忘记账户？点击这里登录

1. 下载图表忘记账户？点击这里登录

In this investigation，weevil emergence，grain damage and grain loss varied with the varieties.Parent weevil survival tended to be lower in the resistant varieties（2008 SYN-EE W DT STR）than that in the susceptible varieties.Thus，the most susceptible varieties had the highest mean number of weevil emergence（40.33±10.26）compared with other varieties.The action of shaking，pouring and sieving might have reduced the number of emerged adults.The higher numbers of emerged adults were a consequence of the larger numbers of parent survival.It could therefore be deduced that the susceptible varieties favoured the development of the larger numbers of immature stages.The results agreed with the previous findings（Garcia-Lara et al.，2004）that progeny tended to be higher in the susceptible varieties than that in the resistant varieties.The shortest developmental period occurred on the99TZEE-Y STR and produced the greatest numbers of emerged weevil with the greatest weight loss of4.86%.Siwale et al.（2009）attributed the median developmental period between 39.67 and 99.30 days to the less than optimal relative humidity in the constant climate room.The longest developmental period occurred on 2008 SYN-EE W DT STR and produced the least number of emerged adults with the least grain loss of 1.84.Using the rating scale of damage parameters，2004 TZE-Y POP STR C4；EV 99 QPM and TZEE-Y POP DT STR QPM COS1 with weighted mean ranging from 9.3 to 9.5，were rated susceptible，while 99 TZEE-YSTR with weighted mean of 15.6was rated highly susceptible.Low numbers of emerged adults reduced low grain loss，which was a clear indication of the variety resistance to the weevils（2008SYN-EE W DT STR）with a weighted mean of 2.5（Table 4）.The behaviour and development of maize weevils was influenced by the nature of the maize varieties and the grain damage and losses were the consequences of emerged adults from the grains.This observation confirmed that chemical and nutritional composition of the grains were important primarily in resistance to insect attack and damage（Dobie，1974）.In another investigation，grain damage ranging from1.94%to 28.57%had been reported on selected maize varieties screened for resistance to S.zeamais（Nwosu et al.，2015）.