【摘 要】
:
荸荠螟是为害荸荠的主要害虫。成虫呈银白色,比稻螟虫蛾稍大。其幼虫蛀食叶状茎,造成枯心死苗。我地荸荠螟虫一般6月上旬初见,8月中旬至9月下旬蛾量剧增,世代重叠发生,大量荸荠螟
论文部分内容阅读
荸荠螟是为害荸荠的主要害虫。成虫呈银白色,比稻螟虫蛾稍大。其幼虫蛀食叶状茎,造成枯心死苗。我地荸荠螟虫一般6月上旬初见,8月中旬至9月下旬蛾量剧增,世代重叠发生,大量荸荠螟自叶状茎中羽化飞出。8月下旬至9月上旬,荸荠进入旺盛生长阶段,也正是荸荠螟的发蛾高峰和产
Water chestnut borer is the main pest damage water chestnuts. Adult silver-white, slightly larger than the rice stem borer moths. Its larvae eaten fronds, resulting in dead heart seedlings. My water chestnut borers first saw early in early June, mid-August to late September dramatic increase in moth generation overlap occurs, a large number of water chestnut borer stems from the leaf stems feather fly out. Late August to early September, water chestnuts into the vigorous growth stage, it is also the water chestnut borer hair moth peak and production
其他文献
梨网蝽的防治答河南省西华县读者满金五(1)人工防治:成虫春季出蛰活动前,彻底清理果园内及附近的杂草、枯枝落叶,集中烧毁或深埋,消灭越冬成虫;9月间树干上束草,诱集越冬成虫,清理果园时
<正> 邻苯二甲酸二丙烯酯(DAP)为高分子单体,其预聚物(代号G1141)在进一步聚合固化之后,有良好的成膜性能和绝缘性能,已开始作为无溶剂漆应用于电讯器材的绝缘处理中,以代替
I will speak about the surprising behaviour of the rational map(x,y)→(y,(y+y-1)/x) in the positive quadrant of the real plane.Then I will consider the trop
病死率是指平均每百名病人中死于该病的人数。某病病死率=因某病死亡人数/同期某病病人数×100%该指标多用于医院住院病人的病死率上。某病死亡率是指一定时期(一般是1年)内
一、金属与人体愈来愈多的研究证明金属与人体的关系十分密切,非常复杂。有些金属在一定量时是必需元素,超过一定量时则会引起人体中毒。过去认为对人体只是有害的金属现在
1999年3月2日,著名电影艺术家、82岁高龄的凌子风微笑着走了 他在生命的最后一刻倾情表达的一句话是:“我爱这个美丽的世界”
On March 2, 1999, a famous movie artist and
The purpose of the present talk is to demonstrate the tables of 5- primary parts up to the stem of gamma 2.We divide the table in three parts A,B and C.A is
The Yuszinsky conjecture is concerned with a problem in the combinatorics of matrix coloring.Given an r by s matrix M,one seeks to color its entries using n