Investigation On Vegetable Diseases In Greenhouse In Luoyang And A Preliminary Study On Root-Knot Nematodes

Installation agriculture can develop the potential of production and improve the yield of per unit area by control the growing environment.However,high temperature,high humidity,low wind and other ecological factors in the vinyl house give a favourable conditions for the genesis of plant diseases.This article focuses on the vegetable cultivar and disease investigate of large vinyl house vegetable in Li-lou village of Luolong district of Luoyang city in Henan province during October,2006 to April,2007.There are some result in follow:1.The investigation showed 35 kinds of diseases were found in the field,which of Cucumber downy mildew,Cucumber bacterial angdular leaf spot,Cucumber root-knot nematode,Tomato gray mold,Tomato virus disease,Celery late blight Celery root-knot nematode and Lettuce stem rot were more severe.2.Root-knot nematodes from Li-lou village of Luolong district of Luoyang were identified.The identification indicated that Meloidogyne incognita was widely distributed in Li-lou village which was the dominant species.3.Bioassays of the toxicity of abamectin,abamectin+chlorpyrifos,abamectin+phoxim+chlorpyrifos and chlorpyrifos against the second-stage juveniles of M.incognita were carried out.The results showed that abamectin was the best one against M.incognita and the LC50 was 13.51 mg/L.Abamectin+chlorpyrifos,abamectin+phoxim+chlorpyrifos and chlorpyrifos of LC50 were 105.90mg/L,171.24mg/L and 235.37mg/L,respectively.4.The quantity of the second-stage juveniles of M.incognita in the rhizosphere soil were investigated.The investigation showed the number of the second-stage juveniles of M.incognita declined gradually from October,2006 to January,2007, and it significantly increased from February,2007 to March,2007.5.This thesis offered some ways which are give a gate to breed the seeding,use the sterile seedling,grafting cultivation,utilize the disease tolerant variety and linked the physical control and chemical control to control the vegetable root knot nematode disease of Luoyang city.And acquire great effect by testing it in the farm.So the ways can promotion in the filed with large acreage.