Development Application Technology of Spinosad to Control Stored Grain Pests
Spinosad is a safe,efficient and environmentally friendly protection agent for stored grain.Due to its broad-spectrum efficiency,low toxicity,low residue and unique insecticidal mechanism,it has no cross-resistance with existing stored grain pest control agents,and has wide application in the field of storage grain pest control.In this study,the automatic spraying equipment for grain in the full warehouse was developed,it was used together with the grain transfer machine,and solved the problems of difficult application,low efficiency and poor uniformity of application in large grain depots.Further,in order to facilitate users to use spinosad to control the stored grain pests scientifically and rationally,and improve the control effect of the drug,the half-life of spinosad suspension in stored wheat and rice was determined to be 6.47 months and 5.81 months,respectively.The application technology of spi-nosad to control grain pests was studied in the wheat storage of full warehouse in the medium temperature and high temperature and high humidity grain storage area in China.The results indicated that spinosad suspension spray ap-plied at the effective dose of 1 g/t in the whole warehouse without phosphine fumigation can effectively control the oc-currence and development of main grain pests,and the protection time can reach about two years.It had no effect on food quality,and no chemical agents were used during the protection period.According to the effective dose of 1 g/t surface mixed grain and aluminum phosphide fumigation,the effective protection time of the main stored grain pests was close to two years,and the use of chemical agents had been reduced during the protection period.The control effect,duration and safety interval of spinosad against main stored grain pests were studied,which provided the basis for formulating the technical regulation of spinosad for controlling stored grain pests.The residue distribution of spi-nosad in rice and wheat,the main stored grain,showed that the main residue of spinosad in the grain shell,flour,rice bran,rice basically no residue.
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