In Cucurbits fungal disease can wipe out plants of the entire field, Is Fungicidal spray only a solution? What are the Integrated Disease Management(IDM) practices?
Cucurbits Gummy Stem Blight is a stubborn disease and its control is hard but mostly advisable comment for its control can be:
1- Crop rotation for two years with non-host plants
2- Avoid sprinkler irrigation
3- Collection of plant debris after harvest
4- Planting pathogen-free seeds
5- Spraying with Bordeaux mixture as follows:
5-1- Seed disinfection with a ratio of 30 per thousand
5-2- Disinfection of soil after planting with a ratio of 30 per thousand
5-3- Spraying the initial leaves with a ratio of 5 per thousand
5-4- Spraying the plant when observing the initial symptoms with a ratio of 5 per thousand
5-5- Repeat spraying at a ratio of 5 per thousand at intervals of ten days before harvest
In Russia, in the Urals, in the southern boreal subzone, various phytopathogenic fungi are active on alien Cucurbitaceae. At the same time, for the last 14 years, an experiment has been carried out to identify methods of combating the fungus Stagonosporopsis cucurbitacearum. Against this phytopathogen, three fungicidal preparations are used, which have long been used in southern Russia. However, none of them help in greenhouse conditions, only outdoors. In greenhouses, only the annual turnover of planting helps to get rid of fungus - we cannot plant Cucurbitaceae in the same greenhouse for two years in a row. Oddly enough, while other means do not help to avoid plant infections.
Thank you Dear Researchers
Reza Khakvar, Reza Khakvar Anton Shiryaev Kouadri Mohamed El Amine Asgar Ali for Insightful answers!
Dear, Sharma,
To control gummy stem blight, you can use seeds free of disease in culturing this method allow to avoid the disease in a good percent.
Also, you can apply Bordeaux mixture to treat seeds or soil or spray it on the foliar group. It's very effective to control the disease.
Collection of the plant debris in the end of the season and burn them far from field and applying crop rotation, also can be applied successfully for controlling this disease.
The gummy stem blight is a serious disease of cucurbits, it can spread through the field of cucurbits easily. The causal agent can damage the tissues of the stem at all stages of the plant growth. The control of this disease must be applied before the culture of the plants by seed treatment with a suitable fungicide to obtain a healthy plants.
Please take a look at the below attached study titled "MANAGEMENT OF GUMMY STEM BLIGHT (BLACK ROT) ON CUCURBITS IN FLORIDA"
By: Mathews L. Paret et al. In the link below:
https://edis.ifas.ufl.edu/publication/PP280
Gummy stem blight spreads by infected seed and soil. High humidity and moisture combined with moderate warmth encourage fungal (Didymella bryoniae) spore germination. During cool weather or after the incidence of disease, fungicide spray can control it to some extent. But some biological control methods are also in practice at large-scale cultivation.
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