棚栽日本网纹甜瓜病虫害发生情况调查

针对网纹甜瓜生长最为关键的开花和座果期进行了网纹甜瓜的病虫害系统调查。调查结果显示,网纹甜瓜主要病虫害有温室白粉虱、蚜虫、美洲斑潜蝇、瓜绢螟、蛞蝓、枯萎病、霜霉病和病毒病;发生最严重的害虫是温室白粉虱,其次是蚜虫,其后依次是美洲斑潜蝇、瓜绢螟和蛞蝓,最高虫口密度分别达57头/叶、35头/叶、6头/株、27头/百株、21头/百株;在病害中,最早出现的病害是霜霉病,然后是病毒病和枯萎病。霜霉病病株率从3%不断上升至11%;病毒病病株率从3%不断上升至15%,枯萎病病株率从1%上升至8%,其中以枯萎病造成的损失最重。

Survey on occurrence condition of Japanese net sweet melon's pests in greenhouse

A survey on occurrence condition of net sweet melon＇s pests in flowering stage and fruit-setting stage was conducted.The results show that the major pests of net sweet melon are greenhouse white fly,aphid,vegetable leafminer,Indian cabbage moth,limax,blight,downy mildew and virus disease.The most serious insect is greenhouse white fly and aphid,then vegetable leafminer,Indian cabbage moth,limax with maximum insect population density of 57head/leaf,35/leaf,6head/plant,27head/100 plant and 21head/100 plant respectively.Among the diseases,the earliest occurrences are downy mildew,then virus disease and blight.The downy mildew rate is from 3% up to 11%,virus disease from 3% up to 15%,and blight from 1% up to 8%.The damage of blight is most serious.