Response of Trichoderma sp and shallot varieties towards plant growth and disease incidence

Abstract

The main diseases that commonly attack shallots include purple blotch disease (Alternaria porri), anthracnose (Colletotrichum gloeosporioides), wilt (Fusarium oxysporum) and Stemphylium vesicarium. Purple blotch disease can cause yield losses of 3-57%. The research is aimed to measure the response of Trichoderma sp and other varieties to the growth and development of shallot disease. The study was conducted at IP2TP Margahayu Indonesian Vegetable Research Institute (IVEGRI), in August - November 2019. The research used a randomized block design (RBD) with 12 treatments and 3 replications. The treatments consisted of three varieties which are Batu Ijo, Sumenep, Trisula, Violeta 1, Maja Cipanas, and Ambasador in combination with Trichoderma and without Trichoderma. Results for the parameters of plant height and number of leaves showed that varieties that have been Trichoderma applied have reached higher height than those without Trichoderma. Ambasador showed the highest plant height (46.27 cm) and the highest number of leaves (44.16 cm). A The intensity of the purple blotch disease attacks A. porri (0.67-8,00%) and S. vesicarium (6.67-23.33%) on all varieties treated with Trichoderma lower than without Trichoderma s for the number of tillers, it is almost the same as an average of 6-7 tillers, except for Sumenep that has only 3-4 seedlings. For wet weight and dry weight per clump in the varieties applied to Trichoderma, the weight per clump is higher than those without Trichoderma, and yet wet weight and dry weight for Batu Ijo without Trichoderma application are relatively similar.