DIFFERENTIAL IMPACT OF FUSARIUM OXYSPORUM F.SP. PISI ON RESISTANCE SOURCE OF PEA GENOTYPES AND ITS CHEMICAL MANAGEMENT

Abstract

Pea wilt caused by Fusarium oxysporum f.sp. pisi has significant impact on reduction of pea yield. Present study was an attempt to find resistant sources in pea varieties/advance lines efficacy of commercially available fungicides against Fusarium oxysporum f.sp. pisi. For this purpose twelve genotypes were sown at the experimental area of Department of Plant Pathology, University of Agriculture, Faisalabad, during 2012-2013 to be screened against wilt disease under natural conditions. The data regarding disease incidence was recorded three times. Only one variety (Jumbo) was found highly resistant. While the advance lines (26709 and 26711) were found resistant to disease. Two lines (26702 and 26714) were moderately resistant and six lines (18372, 18374, 26710, 26712, 26715 and 26723) showed susceptible response. Moreover Climax was found highly susceptible. After screening, in-vitro study was conducted for isolation and identification of pathogen. Pathogenicity test was confirmed through Koch’s postulates. For evaluation of chemicals firstly eight fungicides (Ridomil, Copper Oxychloride, Carbendazim, Nativo, Alliete, Mancozeb, Topsin-M and Difenoconazole) were tested with three concentrations (400, 600 and 800ppm). Among eight, four fungicides (Alliete, Nativo, Topsin-M and Difenoconazole) gave significantly good results as compared to control. These four fungicides were further applied to manage the disease under field conditions. The results revealed that Topsin-M significantly manage the disease where only 31% of wilt incidence was recorded. The systemic mode of infection may be a support to show better performance. Moreover Topsin M. followed by Aliette, Nativo and Difenoconazole respectively. Therefore, Topsin M. may be recommended for controlling wilt disease to pea growers.