chitosan oligosaccharide for prevention of grape downy mildew

Grape downy mildew is  common disease in grape production. Although agricultural measures are very important and necessary, the control of downy mildew cannot be guaranteed. Therefore, in the summer and autumn seasons, frequent rainfall and high humidity in the field are easy to be infected with downy mildew. It is necessary to spray chemicals on a regular basis to prevent it, and it can be eradicated in time at the early stage of the disease, so as to avoid the large occurrence and spread of downy mildew.

Chitosan oligosaccharide treatment can promote the growth of grape vines, increasing the content of chlorophyll, thicken green leaves, enlarged fruits, smooth fruit surface, and can improve the resistance of grape vines, reducing the occurrence of grape downy mildew, and the combined application with fungicides can improve The efficacy is to reduce the use of chemical pesticides by 20% to 30%, reduce or delay the occurrence of grape downy mildew, and the control effect is 65% to 95%. 

 The way to prevent grape, downy mildew

Before the occurrence of grape downy mildew, spray the stems and leaves with 5% chitosan oligosaccharide1000 times liquid evenly, spray once every 7 days, and spray 3 times continuously, and the spray is uniform. In the early stage of grape downy mildew, use 5% chitosan oligosaccharide 1000 times liquid plus 43% tebuconazole suspension 3000 times or 5% oligo chitosan1000 times liquid plus 25% amino·enoyl Combination application of morpholine water agent 1500 times liquid. The fungicide must be used alternately, and the same fungicide cannot be used multiple times in succession. When using, note that when the incidence of grape downy mildew in the field is above 10%, it is necessary to spray with a combination of 5% Chitooligosaccharide water and other fungicides to control the damage of grape downy mildew, and use 5% Chitooligosaccharide water alone Can not effectively control the occurrence and spread. The chitosan oligosaccharide water formulation is suitable for spraying in sunny weather. If it rains within 4 hours after spraying, make up spraying. 

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