How to manage the relationship between yield and quality in young fruit stage of grape

At present, it is in the young fruit period of grape. whether the management of the young fruit period of grape is proper or not is related to the yield and quality of grape in that year. The management contents of the young fruit stage of grape are as follows:

Young fruit stage of grape

The first is to control yield and cut ears and thinning fruits in time.

First of all, the panicle is thinned, which is usually carried out when the grape mung bean is the size after flowering, mainly to remove the ear on the bad fruit setting, diseased and weak branches, so that the ratio of fruiting branch to vegetative branch of each grape tree is controlled at 1.5 ∶ 1. The second is fruit thinning, which is usually carried out twice, the first time, when the grape grain is the size of soybean, combined with the ear thinning work, to remove deformed fruit and diseased fruit; the second time, before bagging the grape, remove the deformed fruit, small stiff fruit, diseased fruit and the grape grains in the dense part, and determine the final number of grape grains per panicle.

Second, increase the application of organic fertilizer to improve the quality of grapes.

When the young fruit of grape is large, it is the critical period of fertilizer and water for grape development. this topdressing is mainly nitrogen fertilizer, combined with the application of phosphorus and potassium, 30 kg urea, 20 kg superphosphate and 20 kg potassium sulfate per mu. This time, topdressing should be combined with irrigation and should be thoroughly irrigated.

Young fruit grape

Third, bagging the ear to improve the quality.

Bagging can effectively prevent grape diseases, bird damage and sunburn, and avoid the pollution of pesticide residues to grapes. Before bagging, a broad-spectrum fungicide must be sprayed to carry out comprehensive disinfection to reduce the incidence of grape ears and improve the quality rate of grapes.

Fourth, prevention and control of diseases and pests.

The main diseases in the young fruit stage of grape are Botrytis cinerea, black pox, downy mildew, powdery mildew, etc., pests include green bug bug, through-wing moth, spotted wax cicada, floating dust, etc., grape anthracnose is high in the vineyard, the young fruit stage is also the key period to control anthracnose. We should not only "cure", but also "prevent" at the same time. Timely spraying effective chemicals can ensure the normal growth and development of grapes.

Disease control agents include 80% Dasheng Mel 45, 25% pyrimidinoxazole, 50% pyrimidinamide water dispersible granules, and azolyl ether. Dysenlian, 20% flumorph, 80% mancozeb, 80.0% tebuconazole, etc. Pest control agents include 5% tocopherol, cypermethrin, 25% thiazide and so on. If there is a grape red spider harm, you can use 15.0% mirex EC 2000 times solution, 20.0% triazotin suspension 1500 times solution.

Note: the grapes in the young fruit stage are more sensitive to the medicament, so it is recommended to use a single agent as far as possible, and choose to use the medicine after 4 o'clock in the afternoon to avoid causing drug damage to the grape fruit and leaves; in addition, spray evenly on both sides of the leaves. The potions should be used alternately.