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| Present Situation Investigation and Decrement Countermeasures of Pesticide Usage in Potato Planted in Winter in Guangdong Province |
| LI Chengchen1，YANG Dongsheng2，SUO Haicui1，AN Kang1，LIU Jitao1，LUO Huanming1，LI Xiaobo1* |
| 1Crops Institute，Guangdong Academy of Agricultural Sciences，Key Laboratory of Crop Genetic Improvement of Guangdong Province，Guangzhou 510640，Guangdong，China；2Shenzhen Noposion International Investment Co.，Ltd.，Shenzhen 518100，Guangdong，China |
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Abstract This paper investigated the occurrence of diseases，pests and weeds in the major potato winter planting areas of Guangdong Province，and analyzed the use state of pesticides by questionnaire survey．The results indicated that the pesticide application method of potato planted in winter in Guangdong was backward．During cultivation period，pests occurred underground included grub and cutworm，that occurred overground were aphids，potato tuber moths and twenty-eight star ladybugs，and the main diseases were black leg，early blight，late blight，black scurf，bacterial wilt and common scab．There were 32 kinds of pesticides commonly used during prevention and control process，but fungicides were 68.75% by according to the classification of pesticide use，and the effective ingredients of fungicides for late blight accounted for 68.57% among the total number of effective ingredients of 13 fungicides．According to the recommended dosage standards，the pesticide usage for controlling aphids，black leg，early blight and late blight were all overcommitted．The average number of use in Guangdong Province was 10 times，and that by the individual households was high up to 22 times．There were 10 kinds of pesticides usage exceeded the recommended number of times in season．The issue of excessive use of pesticides on potato planted in winter truly existed in Guangdong Province．It is suggested that farmer households should implement the measure of combing early warning and monitoring with dosage decrement control method，so as to scientifically improve the control effect，use pesticides rationally and do not blindly increase amount of pesticides．
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Received: 04 June 2020
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