Maintain proper nutrition, especially nitrogen.Avoid working in fields when plants are wet.Maximize distance between susceptible cucurbit fields.Destroy or deep-plow infested plant debris.Rotate away from susceptible cucurbit crops (>2 years).Plant resistant varieties when possible.The following practices can also help prevent disease development:
Cultural Control:Ĭultural management includes scouting regularly to identify the presence of the disease early, before it has had a chance to spread and cause significant damage. Favorable conditions for spread and infection include warm temperatures (70-90✯), high & prolonged leaf wetness, early & late-season plants, and poor plant nutrition especially low nitrogen. The pathogen may also survive on infected seed. These lesions can produce new conidia that infect new plant tissue, spreading through the same process.
These conidia can spread via wind, splashing water, equipment, or insects, causing lesions where they contact and infect the plant. Once temperatures warm and leaf wetness increases, these soil-bound mycelia produce spores called “conidia” that can infect living plant tissue. The fungus can survive for up to two years in this debris as dormant fungal threads called “mycelia”. cucumerina is infected soil-bound plant debris. Alternaria cucumerina survives on infected soil-bound plant debris, the spores of the pathogen spread on wind, splashing water, workers, equipment, or insects. Fruit can also experience sunscald from leaf loss, as well as reduced yield. Lesions can also develop on the fruit, appearing first as sunken, brown spots that can become dark and fuzzy as the lesion produces spores (sporulation). This pathogen causes brown lesions on the leaves that can develop concentric, target-like rings and a yellow surrounding halo. Cucurbit crops include watermelon, cantaloupe, cucumber, zucchini, pumpkin, and winter squashes. Cucurbit Alternaria leaf blight is a fungal disease of cucurbits caused by Alternaria cucumerina.
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