稻螟发生演变及防治对策探讨

APPROACH ON THE DEVELOPMENT OF RICE STEM BORERS AND THEIR CONTROL STRATEGIES

稻螟为浙江省水稻的主要害虫。近５０ ａ 来稻螟发生的演变是：５０ 年代后期，三 化螟随着单季稻改为双季稻，而发生量大增，采用“六六六”药剂防治得到控制，至１９６５ 年，因产生抗药性而再度严重。二化螟在５０ 年代经过一度下降后，至６０ 年代初又有回升，随着三熟制的推广，迟熟早稻扩大，其发生受到抑制，至７０ 年代中期， 杂交稻面积扩大，发生 为害随之加重。８０ 年代后期，因种植业 结构调整，二化螟和三化螟又一次回升。发生上述演变的原因是耕作制 度改变、品种的更换、种植 业结构调 整、防治措施的发展和气候的变化等。防治对策应采取：适时灌水耕耙 等农业防治为基础，优 化药剂防 治策略，选用对口农药等科学用药为重点的综合治理措施。

Rice stem borer is the main pest on rice in Zhejiang province. For recent 50 years, the low of development of rice stem borers is as follows, In the late of 1950's, yellow rice borers increasely occurred as single harvest rice replaced by double harvest rice, which was controlled by using BHC. For the resistance to BHC, to 1965, yellow rice borers reoccurred greatly. The population of striped rice borers even declined in 1950's but increased in the early 1960's. With the extension of three crop system per annual and the expansion of late mature early rice, the development of striped rice borers was controlled. To the middle of 1970's, with the expansion of hybrid rice, striped rice borers did great damage again. In the late of 1980's, with the adjustment of cropping system, the populations of strip rice bores and yellow rice borers increased once more. The reason for the development of rice stem borers mentioned above is that the cropping system was changed, cultivars of rice were replaced, the structure of cropping was adjusted, control methods were developed and the climate changed, etc. The integrated management measure should be adopted such as irrigating and ploughing in good time, optimizing the chemical control strategies, selecting the right pesticide.