旱地保苗措施──垄沟种植

ON CYCLE OF INFECTION OF RICE SHEATH BLIGHT IN JILIN

摘要:

本文根据我省西部农田春旱，保苗困难的问题，提出将传统的垄作改为垄沟种植。论述了垄沟种植的可行性，建议试验推广。

Abstract:

Based on isolating infected plant which lived through winter and sclerotium,isolating and inspecting activity of hypha in field by burying test tube,investigating disease epiphytotics on different cultivate manners both in paddy-field and dry field covered with plastic film by hanging tag,analyzed datum and compared every year’s atmospheric datum,we got conclution that in Jilin the first aggressive sourees mainly were floating sclerotium,then infected plants and herbs, but in dry field mainly were sclerotium and infected plants.If ten days’average temperature was higher that 18℃ and RH was higher than 70%, first aggreession will happen and lesion will be found.This stage was also suitable for horizental development,the repeat aggressive courses mainly were hypha,then sclerotium which were formed in same year.If ten days’ average temperature was higher than 21℃ and RH was higher than 80%,it was suitable for vertical development, repeat aggressive sources were hypha. Sclerotium have no dormant time. They can live through the winter and also can become repeat aggressive courca.