桑红蜘蛛、桑蓟马在云南省不同地域桑园的发生规律及防控要点

选择云南省蒙自、陆良、楚雄、祥云、鹤庆、保山6个县(市)坝区桑园为试验点,调查各试验点桑园主要害虫桑红蜘蛛、桑蓟马的发生规律。结果表明:因分布于不同海拔高度区域的各试验点微观气候环境不同,以及桑园栽植的桑树品种不同,2种害虫的发生危害和消长规律存在差异;春、夏、秋季干旱或短时期少雨、无雨,均会导致2种害虫的发生危害加剧。根据各试验点的调查结果建议:正常年份蒙自、陆良坝区桑园应同时防治桑红蜘蛛和桑蓟马,保山、祥云坝区桑园以防治桑红蜘蛛为主,鹤庆坝区桑园以防治桑蓟马为主;春夏之交、夏末初秋各试验点桑园害虫的发生进入高峰期,当田间调查虫情指数为15.00时,应及时进行化学防治,控制害虫的蔓延危害。

Occurrence and Control Measures of Terancychus cinnabarinus Boisduval and Pseudodendrothrips mori in Different Regions of Yunnan Province

In present study,occurrence of two major mulberry pests,Terancychus cinnabarinus Boisduval and Pseudodendrothrips mori,was surveyed in mulberry fields of six counties/municipalities named Mengzi,Luliang,Chuxiong, Xiangyun,Heqing and Baoshan of Yunnan Province. The results indicated that: occurrence of these two pests varied with the mulberry varieties cultivated and the regional climatic conditions at different altitudes of the mulberry fields. It was found that drought in spring,summer and autumn,and low rainfall or no rainfall within a short period would aggravate the occurrence. According to the results from each survey spot,it is suggested that,in the year with normal rainfall,both Terancychus cinnabarinus Boisduval and Pseudodendrothrips mori should be considered as the control target in mulberry fields of Mengzi and Luliang plains,Terancychus cinnabarinus Boisduval be the major control target in mulberry fields of Baoshan and Xiangyun plains,and Pseudodendrothrips mori be the major target for control in mulberry fields of Heqing plain. During the transit periods from spring to summer and summer to autumn,the occurrence of mulberry pests at all survey spots increased and reached its peak level. It is recommended that,when the pest index from field survey reached 15. 00,chemical measures should be taken in time to control spread and damage of the pests.