芦笋茎枯病发生规律及其药剂防治

本文在田间接种条件下研究了芦笋茎枯病发生规律及药剂防治效果。结果表明：在出土二周内芦笋嫩茎的感病性与接种时嫩茎的出土天数呈负相关；茎秆上病斑的高度和分布范围均与接种时茎的出土天数呈正相关；出土后培土比培土后出土的嫩茎发病率高１４．７７％，且后者地下部主茎较少发病，说明土表的菌源及其气传孢子是主要的侵染源。芦笋嫩茎期是施药防治的关键时期，１００００ｍｇ／Ｌ的多菌灵混配制剂表现出较好的治疗和保护作用，而在常规施药浓度（１０００ｍｇ／Ｌ）下效果均不理想。

Studies on the Occuring Regularity of Stem Blight of Asparagus and its Chemical Control

The occuring regularity of stem blight caused by Phomopsis asparsgi Bubak at the shoot stage of asparagus was studied by artificial inoculation in the experimental field.The disease indexes of shoots were negtively related to the days growing out of soil within two weeks,and the height and distribution of lesions on stems were postively related to that time. The infection of shoots hilled up after growing out of ground was more serious than those did that before,the disease incidences of stems were 52. 27% and 37. 50% respectively. This result indicated that pathogens of stem blight was mainly from the residues on the surface soil and from the spores in the air. In the meantime,the protective and chemotherapy effects of some chemicals were tested. Some mixtures composed of carbendazim showed good protective and chemotherapy effects at 10 000mg/L.