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Anthracnose-Twister disease caused by Colletotrichum gloeosporioides and Gibberella moniliformis has always been the major problem of onion growers every onion season due to absence of efficient and cost effective management system, thus, this study was conceptualized by integrating all the available management approaches to put the disease at bay. The results showed that management program T3 (Benomyl-Propineb-Difenoconazole~Propiconazole (DP)Difenoconazole-Carbendazim-Mancozeb-Trichoderma sp.) had the lowest % disease incidence and severity, where ideal size of the marketable bulbs, highest number and heaviest weight of the marketable bulbs were also obtained. It was also found out to be the most cost effective management program and had the highest net income. On the otherhand, highest % mortality was observed in T4 (Carbendazim---Mancozeb---Difenoconazole---Trichoderma sp.---Benomyl--Propineb---DP) and T9 (Untreated Control). It was also in this plots together with T8 (Farmer’s Practice) where the highest level of % incidence and % severity, lowest and lightest weight of the marketable bulbs were obtained. Furthermore, late transplanting date as well as using 15x15cm spacing between hills and rows and 5-day irrigation interval contributed against the occurrence of anthracnose-twister disease. The weather factors prevailing in the area were found to have an influence in the occurrence and progress of the disease in all the treated plots as well as in the control plots (T9) as it shows strong relationship between low temperature and small amount of rainfall which promotes low levels of incidence and severity. Moreover, results showed that application of protectant fungicide during the early part of the season followed by systemic fungicide application can bring down the disease incidence and severity as adequate protection to the plants were provided.

plant pathology and quarantine journal of fungal biology

Development of integrated disease management program against Anthracnose-Twister (Colletotrichum gloeosporioides-Gibberella moniliformis) disease of onion (Allium cepa)