In the process of mango planting, it is likely to encounter anthracnose, powdery mildew, mango gum tip blight, fruit rot and other diseases, as well as class A pests such as short-headed leafhopper, aphid, flat-tailed moth, young mosquito and leaf-cutting elephant. How to prevent this common mango disease?

Colletotrichum gloeosporium

Mango anthracnose infects leaves, flowers, fruits and buds, causing flowers and fruits to fall off, and the picked mango can be killed and rotted again. After infection, many branches are round and dark brown with pale yellow halo around them, which expand into round, polygonal or irregular spots. In severe cases, the leaves wrinkle and twist, and finally wither. After the fruit is sick, dark brown round spots are produced, and there is a slight depression in the middle of the diseased spots. The muscles of the diseased fruit are stiff and eventually rot and deteriorate.

The prevention of the disease can be combined with cleaning the garden, pruning and eliminating diseased branches and leaves, and focusing on harm. The application of chemical control depends on the obvious stratification of phenology, climate and physical conditions to determine the time, frequency and type of application, with the aim of protecting flowers and fruits and improving barnyard grass rate.

In the emergence stage, 80% mancozeb (wettable powder), 2.5% zineb (wettable powder), 75% thiophanate-methyl (wettable powder) and 50% chlorpheniramine (wettable powder) can be sprayed 400-650 times, 400-0/000 times per week. 80% Keledan (wettable powder) and 65% thiram (wettable powder) 1000 can be sprayed 7 ~ 1000 times a day, 2 ~ 3 times in total. If the fruit is soaked in 0. 12% (wettable powder) triadimefon for 1 min and then soaked in 5 1℃ water for 15 min during storage and transportation, it can not only sterilize, but also have a certain practical effect of preservation and refrigeration.

Mango powdery mildew

Downy mildew of mango mainly hurts inflorescences, but also fruits, leaves and tender organs. White powdery soft spots appear at the injured part first, and then the soft spots slowly cooperate to produce a layer of milky white powder (mainly hyphae and conidia), which makes it difficult for inflorescences to bloom. And the injured fruit will fall.

When mango downy mildew is controlled, 250 ~ 320 mesh sublimed sulfur can be sprayed or 50% triadimefon (wettable powder), 70% thiophanate-methyl (wettable powder) 1000 times, 25% fenxiuling (wettable powder) 250 times and 40% Kangkuning (liquid, 3~4 sticks /50KG) can be sprayed.

Phytophthora blight and fruit rot of mango

At first, the diseased stems or organs faded, so we could see small white particles. Then, the stems of mango trees turned dark brown after discharging brown epoxy resin. Some branches above the diseased part are likely to be pulled out below the diseased part, but the leaves will fade and eventually all branches will wither. The mechanism of branch peeling found that the roots and phloem turned pale brown, and pathogenic fungi spread in those positions, leading to the rapid death of branches.

After the disease, the fruit gradually turns dark brown, and the exocarp and fruit slowly rot and ooze thick juice. When the climate is wet and cold, Fusarium wilt will rot faster, and then become stiff fruit, and small white particles can be seen on both Fusarium wilt and dead branches. The key to prevent this disease is to clean the fluff, which can be smeared with 10% French Bordeaux pulp; Spray 0.3% copper chloride, 40% ethyl aluminum phosphate (wettable powder) for 500 times or wipe the affected area with 75% tridemorph (EC) 1000 times.