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我市地处川中,常年种植油菜110万亩左右。但由于受栽培条件和病虫危害的制约,亩产一直徘徊在100公斤左右,特别是结角期蚜虫的日益严重,对产量损失极大。为了确定防治适期和防治指标,为经济有效的防治提供理论依据而进行了本项调查。现将调查结果初报于后: 一、调查内容和调查方法 1、发生规律调查①全生育期发生规律调查:从油菜移栽后7天起至收获前7天止,共调查6块(田土各3块),每隔3天调查1次,每块地定五点,每点10株,共3000株。整个生育期均不防治蚜虫。分别记载调查总株,有蚜株,有蚜量及油菜生育期。②抽苔至收获期调查:田土各3块,
The city is located in Sichuan, perennial planting 110 million mu of rapeseed. However, due to the cultivation conditions and pests and diseases constraints, mu yield has been hovering around 100 kg, especially in the corner of aphids growing serious losses on the yield. In order to determine the appropriate control measures and prevention and control indicators, in order to provide a theoretical basis for cost-effective prevention and control carried out the survey. First, the survey results and survey methods: First, the investigation and investigation methods 1, the occurrence of regular survey ① law of the whole growth period survey: 7 days after transplanting from rape until 7 days before harvest, a total of 6 (field Each 3), survey every 3 days 1, each set at five points, each point 10, a total of 3000. Aphids are not controlled throughout the growing season. Respectively recorded the investigation of the total strain, aphid strains, aphid amount and rape growth period. ② bolting to the harvest period survey: 3 each field,