POSSIBLE MORPHOLOGICAL AND CHEMICAL RESISTANCE MECHANISM OF SHALLOTS (ALLIUM CEPA VAR ASCALONICUM) TO COLLETOTRICHUM GLOEOSPORIOIDES PENZ

Shallot production has many challenges, including the anthracnose disease caused by pathogen Colletotrichum gloeosporioides Penz. Disease characteristics include severe twisting of leaves, neck elongation, and necrosis leaves. This can cause yield loss up to 100 percent. In addition chemical control practices, resistant shallot varieties will be very useful in decreasing losses. However, information about existing C. is limited. The study objectives are identify morphological characters secondary metabolites leaves that may associate with defense mechanism shallot. Fourteen underwent a single factor use randomized block design field laboratory experiments. experiment transpired from January June 2021. Planting healthy bulbs all genotypes polybag containing sterile media continued artificial inoculation after plant had 3–5 test showed Sumenep variety best level gloeosporioides, severity score 30.19%. On other hand, Blue Lancor most susceptible, reaching 95.05%. also found an indication possible resistance shallots relates thickness palisade tissue (r =-0.8, P < 0.001), induced associated detection presence increase carbamic acid concentrations.