Study of the field efficiency of 40% Bao Sang Ling EC and its safety interval for silkworm
he eni yao xinhua yang peihua fang limin gu liliu zhou weilin chen guizhu xu jianfang(1sericulture technical support station of suzhou; 2sericulture technical support station of wujiang; 3sericulture technical support station of zhenze; 4plants protection and quarantine station of suzhou)