Apple summer common disease control methods!

Leaf spot

Leaf early onset will appear brown near circular spots, with the development of the disease gradually expanded connected, the edge was purplish brown, wet when there are dark green to black gray mildew layer, onset period generally in June ~ September.

The key of drug control is the protection at the germination stage of new shoots. 80% mancozeb, metadiol and isobarbazone can be used, and caproxol and pyrizoyl ester can be used for the existing diseases.

Leaf spot

The main damage to apple leaves, symptoms of the green margin brown spot, concentric wheel-pattern, needle, mixed type, brown spot disease, and other types, generally damage to the lower crown or bore of the leaves, new leaves rarely incidence, disease leaves are easy to fall off.

Every year from may to July is the onset of the disease, rainy high temperature will induce the disease.

Fluocyrazole and pentazolium can be used as the control agents.

Powdery mildew

Easy to harm young leaves, new slightly, flowers, young fruit and so on.Dead shoots, new tips curly, leaves and fruit white powder layer, flowers and fruit malformation.

Warm and dry spring and cool summer are conducive to the occurrence and prevalence of the disease.

The key prevention and control periods were before germination, before and after flowering, before and after falling-off, and before bagging. The prevention and control were conducted by pyrazole ether ester, ethylsulfonate, artemisazole and triazolone.

Ring spot

Main damage branches and fruits.

Branches suffer, initial meeting gives birth to round wart-like protuberance closely, connect after become a piece to lose water depression, ill be good at a common boundary is apparent.Small brown or yellowish-brown spots are formed around the pores of the fruit, and then the diseased spots expand into round or near round concentric wheel lines, and ooze yellowish-brown fluid until the whole fruit rots.

Fruit infection mainly occurred from may to August, and was easy to occur in case of continuous rainfall and high field humidity.

As the bacteria that infects the fruit are mainly from the branches of the tree, it is necessary to scrape off the spots and cut off the branches.After scraping off the sick part, apply carbendazim and triazole to prevent the spore from spreading.

anthrax

Mainly harm leaves and fruits.

In the early stage of leaf onset, black necrotic disease spots were formed on the leaf surface. The edges of the disease spots and healthy parts were blurred, and then the disease spots began to spread and connect into sheets, resulting in scorched leaves.Fruit onset, rotostriate spot, red mucus precipitation when wet.

General 5 months after visible onset, the case of continuous rain disease rapid development.

Methiopentazol, imifenamine, bromobacitrile and so on can be selected as agents. It is necessary to pay attention to the prevention and control of the early garden and the initial infection period, otherwise the disease will be difficult to control in the rainy season.

Virus disease

Common Mosaic virus, green leaf spot virus, rust fruit virus and other main damage to leaves and fruits.At present can not cure, should give priority to prevention.Including the selection of non-toxic seedlings, tree growth, safe pruning, with the trend of splashing rain transmission, slow development, combined with the management of the park, gradually remove.

In addition to actively adopting the corresponding plant protection scheme for prevention and control of the above diseases, we also balanced top dressing according to different growth periods of apples to enhance tree potential and improve resistance.In the apple expansion period, small make up recommend the use of Shanghai yongtong aike 15-6-35+TE formula for dressing, the amount of 8-10 kilograms per mu, use 2-3 times, can effectively reduce the occurrence of disease, the apple expansion and coloring effect is very significant.