1. Symptoms of damage: mainly damage flowers and young fruit. Flower bud disease, the initial disease gradually softens withering and rot, after the buds and receptacles dense brown layer of fungus, eventually, diseased flowers fall off, or can not fall off and the residual young fruit, causing the incidence of young fruit. Onset of young fruit, began to produce light green round spots on the fruit surface, and later with the rapid expansion of the lesion, the color gradually dark brown, light fruit growth stagnation, severe fruit rot, and finally shrinkage into a stale fruit Hang on the branch.
2. Control methods
(1) Before warming the greenhouse, thoroughly clean the garden and deepen the tree tray to reduce the initial infestation source.
(2) Doing a good job of sparse flowering and fruit thinning to reduce contact infections caused by field operations such as artificial pollination due to dense flowers and fruit.
(3) Timely removal of diseased flowers, diseased fruits, and flower organ residues that cannot be removed on young fruit to reduce the source of infection. Before the disease minister takes gray mold, diseased flowers and diseased fruits are removed in time and put into plastic bags and taken out of the warm outdoors to be buried or burned.
(4) Control the amount of irrigation and irrigation times. Watering should be done on a sunny day. Avoid watering on cloudy days. In the morning, try to maintain a high temperature to atomize the dew on the top of the greenhouse as soon as possible; extend the air release time in the afternoon and increase the air flow to reduce the humidity. In the flowering and young fruit period, even if there are many cloudy days and the temperature is low, it should be promptly released. In addition, the use of mulching can reduce the incidence of gray mold.
(5) Control the use of available nitrogen fertilizers to prevent new shooters from becoming buddies, and do a good job in the orchard's ventilation.
(6) It is best not to intercrop the crops that are susceptible to gray mold, such as canola, lettuce, and pepper, in the greenhouse.
(7) Before spraying, spray a preventive drug. After flowering, spray it once every 10 days. Spray 2 or 3 times. Use pesticides alternately to avoid drug resistance. The available agents are: 50% fast-acting WP 1500 times, or 50% benomyl 1200 times wettable, or 65% triamcinolone WP 1000 times, or 50% bleomycin Wet powder 600 times, or 50% carbendazim 500 times and 50% thiram 500 times the mixture, or 75% chlorothalonil 600 times and 70% mancozeb 500 times the mixture. In addition, prior to the onset of illness, it is also possible to use the fast-spiratory smoke agent for fumigation treatment at a dose of 300 grams per mu.
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