Common symptoms of premature senescence in greenhouse cucumbers are: atrophy of plants, yellowing of leaves, late fruit ripening, low yield, and severe plant death. The main cause of premature aging is caused by inappropriate environmental conditions and improper management. Preventive technical measures:

First, take heart. The main role of the topping is to prevent the plants from growing steeply, reduce excessive nutrient consumption, and promote plant multi-fruits. Practice has shown that when the cucumber has about 25 leaves, it can promote the formation of the gourd; otherwise, its nutrient transportation is hindered.

Second, remove old leaves. To remove the old leaves, dead leaves and diseased leaves in the lower part of the plant in a timely manner can not only reduce nutrient consumption, but also effectively control the spread and spread of the disease, help to ventilate light and reduce temperature, and promote plant growth.

Third, early harvest. Under normal circumstances, early harvesting is advocated and cucumbers can be harvested after they have just seen the seeds. In this way, not only can nutrient consumption be reduced, but also premature plant ageing can be prevented. Fourth, timely fertilization. Timely top dressing can provide sufficient nutrients for plant growth and development, which is a key measure to prevent plant aging. The best time for topdressing is: catch 1-2 times of fruit after harvesting, and combine the manure and urine of the decomposed manure with watering; also apply topdressing nitrogen fertilizer and phosphate fertilizer, and apply 15 kg of diammonium phosphate per 667 square meters. Dissolve fertilizer in water and apply it.

Fifth, irrigation cooling. In the season where the temperature is relatively high, appropriate irrigation and cooling can be performed according to the weather and soil moisture conditions. A small ground irrigation system should be used to prevent the rushing of the ridges and damage to the plant roots.

Six, disease prevention and pest control. Attention should be paid to the timely control of aphids, whitefly, red spider, downy mildew and gray mold. Spraying with 50% clotrimazole 400-fold or 100-unit penicillin 200-fold is better if the two drugs are mixed together.

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