2013年我国黏虫发生特点分析

2013年黏虫维持了2012年以来的重发态势。二代黏虫在东北、华北、黄淮局部、江南局部、西南地区普遍发生,多种作物受害严重,总体发生程度重于2012年同期,山西、河北等局部地区大发生。三代黏虫在东北、华北和黄淮局部等地偏重发生,虽然发生面积、发生程度整体上不如2012年严重,但是仍显著重于常年,并且在辽宁、山西、山东的局部地区造成严重危害。分析提出,监测防控及时到位、关键时期气象条件不利,是2013年三代黏虫发生程度轻于2012年的主要原因。

Occurrence characteristics of armyworm in China in 2013

Beauveria bassiana is an important entomogenous fungus which has the potential for pest control. Mycelia are the major structural unit of B. bassiana, and hydrophobins are considered to participate in the process of aerial hyphae. In the present study, relative expression abundance of B. bassiana HsbA (hydrophobic surface binding protein) gene in aerial hyphae and substrate mycelia were analyzed by using qRT-PCR. The results showed that the expression level of HsbA gene in aerial hyphae was significantly higher than that in substrate mycelia. Based on the above results, we concluded that up-regulated expression of HsbA gene might increase the amount of protein encoded, which could regulate the development of aerial hyphae in B. bassiana. This conclusion provided not only an approach to strain improvement, but also a guide for commercial production of this fungus.