Disease Survey of Moringa oleifera and Preliminary Studies on the Chemical Control for Pod Rot of M. oleifera in Yunnan

PurposeThe study was focused on the Moringa oleifera diseases investigation, distribution and their damages in the main M. oleifera planting regions in Yunnan, then on the evaluation of the control efficacy of fungicides on the pod rot of M. oleifera in the field so as to provide reference for M. oleifera pod rot control.

MethodM. oleifera disease survey in the main M. oleifera planting regions of Jinghong, Yuanmou, Yuanjiang, Jiangcheng, Longling, Mangshi and Funing in Yunan was conducted by 5-point sampling method from 2016 to 2017. The diseases were diagnosed by symptom observation, pathogens isolation and identification. 70% mancozeb wettable powder 330 times liquid, 50% carbendazim wettable powder 750 times liquid, 70% mancozeb (WP) 330 times liquid mixed with 50% carbendazim (WP) 750 times liquid in the proportion of 1:1 were selected to evaluate the control effect on pod rot of M. oleifera in the field with water as control. All of the treatments were conducted with conventional spraying.

ResultDisease investigation results showed that the common diseases in the main M. oleifera planting regions of Yunnan included pod rot, pathogenic dieback, tender shoot wilt, anthracnose, powdery mildew, root and basal rot and so on. Pod rot is the most common one occurring in each of the investigated region, in which Mangshi is the most severe occurrence region with the incidence up to 72%. The field trial test results indicated that all of the three fungicides showed certain control effects against to pod rot of M. oleifera, among them 70% mancozeb (WP) 330 times liquid showed the best control effect with control effect of 69.79%, and then the recommended 70% mancozeb (WP) 330 times liquid pooled with 50% carbendazim (WP) 750 times liquid in the ratio of 1:1 showed 68.01% control effect, while the control effect of 50% carbendazim (WP) 750 times liquid was only 57.43%.

ConclusionWe investigated and identified 6 kinds of main diseases of Moringa in M. oleifera plantations in Yunnan Province, and screened out the suitable chemical insecticides to control the pod rot.