How to use chemical methods to control garlic diseases

I. growth period

(1) to prevent and cure garlic rust. If there is a year with much rain, check the disease center in early spring and prevent it in time. Generally, 15 per cent of the powder is 1000 times of the wettable powder, or 15 per cent of the wettable powder 1500 times of the powder plus 70 per cent mancozeb wettable powder is 1000 times of the solution in the first ten days of April, and once more after 10 to 15 days, generally 2 to 3 times depending on the disease.

(2) to control leaf blight, leaf spot and gray mold of garlic, choose 75% chlorothalonil wettable powder 800x solution, or 64% chlorothalonil wettable powder 500x solution or 50% copper succinate wettable powder 500x solution or 50% prohydantoin wettable powder 1500 times solution, depending on the disease in the field at the end of November or late March, control twice in spring.

(3) for the prevention and control of virus diseases, the use of virus-free garlic has the best control effect, the plants in the field are strong, the leaves are dark, and generally there is no need for medication. Secondly, the initial stage of the disease was sprayed with 1000 times of 1.5 per cent phytotoxin or 5 per cent of bacteriorubicin.

(4) to control bacterial soft rot, the leaves were sprayed with 72% agricultural streptomycin soluble powder at the initial stage of the disease, and 77% could kill 4000-fold solution of wettable granules, about once every 7 days, and 2 to 3 times according to the disease.

Second, post-harvest and storage period

The main purpose is to prevent and control diseases during the storage period, such as Penicillium, Botrytis cinerea, Purple spot, etc. A few days ago, the following measures were mainly taken:

(1) stop irrigation 5 days before harvest to prevent garlic skin from decay and storage.

(2) avoid mechanical damage as far as possible during harvest, clean up the remains of diseased plants in time, take them out of the field, and concentrate on high-temperature heap and retting manure, which is helpful to reduce the source of disease and the occurrence of disease.

(3) the harvested garlic should be dried in time, peel off the skin according to the requirements of commercial garlic, and pick out rotten garlic, green garlic and so on.

(4) after storage in cold storage, fumigation and disinfection with "Luda" brand fruit and vegetable fumigant can effectively prevent and cure the further harm of garlic to garlic in the later stage and storage.