2015-2022年黑龙江省大豆产区大豆胞囊线虫病调查OA北大核心CSTPCD

Soybean cyst nematode severely restricts the improvement of soybean yield and quality in Heilongjiang Province.To determine the distribution and occurrence of soybean cyst nematode in Heilongjiang Province,a random sampling survey was conducted from 2015 to 2022 in the main production areas of soybean.The investigation found that cysts were detected in all regions from 2015 to 2018 except Daqing,Anda,Taikang,and Lindian in 2015.The number of cysts per 100 gram of dry soil increased with each year,showing a positive growth trend on the average.However,compared to 2016,there was a slight decrease in the number of cysts and the average growth rate in Sunwu,Yi'an,and Daqing during 2017.The results of the difference in cyst detection rates between 2015-2016 and 2016-2017 showed a decrease in 10 cities and counties,indicating that soybean cyst nematode is prevalent in soybean areas of Heilongjiang Province.Between 2019 and 2022,all samples tested positive for SCN.Detection rates of cysts in 12 areas remained consistent at 100％for four consecutive years.The average number of cysts per 100 grams of dry soil ranged from 3.2 to 38.7,which was slightly lower than the figures recorded from 2015 to 2018.Specifically,in Fujin,Tailai,and Suibin,the number of cysts detected over the four years was less than 10 per 100 grams of dry soil.In contrast,Harbin and Shuangcheng observed an average cyst count exceeding 20 per 100 grams of dry soil in the samples each year throughout 2019-2022.According to the identification of races,the dominant races are still race 3.In addition,race 6 was detected in Yi'an and Daqing,while race 14 was detected in Anda.This study has clarified the occurrence current situation of soybean cyst nematode in the main soybean-producing areas of Heilongjiang Province,providing guidance for the comprehensive control and breeding of resistant soybean varieties against soybean cyst nematode.