成都地区黄秋葵蚜虫天敌种类及其类群动态研究

2014-2015年,调查研究了成都地区黄秋葵蚜虫发生特点、其天敌资源种类和优势天敌类群发生动态,发现成都地区为害黄秋葵的蚜虫主要是棉蚜,其天敌资源有5目8科21种,优势种有棉平突蚜茧蜂、异色瓢虫、龟纹瓢虫和大草蛉。棉蚜发生量在黄秋葵移栽40d即达到高峰期,后逐渐下降,棉平突蚜茧蜂发生动态与棉蚜的发生动态具有较强的跟随关系,瓢虫、草蛉和食蚜蝇的发生动态差异较大,与棉蚜的发生动态跟随关系不明显。

Species of aphid natural enemies and the occurrence pattern of dominant group on okra in Chengdu

Conidial suspensions of 25 Magnaporthe oryzae isolates from three susceptible varieties,‘Longjing 17’,‘Jite 639’and ‘Kendao 10’,in Heilongjiang Province,were sprayed onto four sets of differential hosts to deter-mine their physiologic races and virulence types.9,8 and 8 isolates from these three varieties were differentiated into 8,7 and 4 physiologic races by China differential hosts,respectively,while 9,8 and 8 races by Japanese dif-ferential hosts.Using the local varieties as differential hosts,the isolates with different origins were divided into 8,7 and 5 pathotype,respectively.24 rice lines carrying single resistance genes,however,differentiated these i-solates into 9,7 and 8 pathotypes,respectively.