论文部分内容阅读
现在正是露天西瓜伸蔓、开花期,近日持续的连阴下雨,对西瓜授粉和坐果不利,加上天气温度变化较大,西瓜病虫害发生比较普遍。因此,加强对当前西瓜病虫害的防治与管理尤为重要。露天西瓜在20~25℃温度条件下,约经20~25天,节间伸长,植株匍匐生长,标志植株旺盛生长。此期生长点是生长中心,主蔓、侧蔓间尚无养分的转移,病毒病很容易发生。此期重点做好蚜虫、蓟马和病毒病的预防。防治病毒病可用病毒A或克毒宝
Now it is open watermelon stretch vine, flowering period, the continuous continuous Yin rain, watermelon pollination and fruit adversely, coupled with the greater temperature changes, watermelon pests and diseases more common. Therefore, to strengthen the current watermelon pest control and management is particularly important. Open watermelon at 20 ~ 25 ℃ temperature conditions, about 20 to 25 days, internode elongation, plant creeping growth, marking the strong growth of plants. The growth point of this period is the growth center, the main vine, side transfer of nutrients between manners, virus disease is very easy to happen. This period focus on aphids, thrips and virus disease prevention. Control virus disease available virus A or poison Po