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Planting cantaloupe in the greenhouse
Cantaloupe blight is a common and serious disease that affects greenhouse-grown cantaloupes, particularly when the stem becomes severely infected. The infection typically starts as a circular lesion around the stem, leading to wilting and the formation of ulcers at the affected site. This condition, also known as black rot, can cause up to 30–50% of plants in an area to become diseased. It is a major threat to cantaloupe production across all growing regions, making timely pesticide application essential for control.
The early symptoms of the disease are often visible on the vines, where pale yellow-green oily spots appear. These lesions may exude a red liquid that dries into dark brown masses. As the disease progresses, the affected areas become dry, sunken, and brittle. Small black spots—spores of the pathogen—form on the surface of these lesions. According to the Chinese Pesticide Network, within three to four days of infection, the lesion will begin to encircle the stem. After one week, spores start to develop, and by day 14, the disease reaches its peak. At this stage, the plant may die.
When fruits are infected, the lesions usually appear near the ground. Initially, they look like greasy spots, about 1.5 to 2 cm in size. They start as light brown, slightly sunken areas that gradually turn pale. Black spots and irregular cracks form on the surface. High humidity can cause the lesions to expand and develop water-soaked areas, allowing the pathogen to penetrate the fruit flesh. A white velvety layer of hyphae appears on the surface, followed by black granules after a few days. In cloudy or damp conditions, you may see black particles or pink spore clusters emerging from the lesions.
To effectively prevent and manage cantaloupe blight, several strategies should be implemented. First, select disease-resistant varieties based on local conditions. Second, use raised beds with mulch film to improve drainage and reduce humidity after rain. Proper field drainage and careful fertilizer management are also important—apply well-decomposed organic manure, along with adequate phosphorus and potassium fertilizers. During the mid-to-late growth stages, apply top-dressings appropriately to avoid over-fertilization.
Third, chemical control is necessary. According to the Pesticide Network, it's recommended to use seedling soil nutrition bags for transplanting. Mix 45% triadimefon thiram or 40% triadimefon wettable powder with fertile soil. This method helps protect young plants from early infections and improves overall crop health. By combining cultural practices with appropriate chemical treatments, farmers can significantly reduce the risk of blight and ensure better yields.