The leaves of golden marbles have prominent black blocks, how to prevent and cure suspected scab

The pathogen of scab is a fungus of the subphylum semicolonium. The damaged leaves appeared waterlogged round spots at the initial stage, and then turned waxy yellow. The disease spot expands with the growth of the leaf, and gradually cork, protruding to one side of the leaf shows a conical scab, the other side is sunken inward, and the leaves with many disease spots are twisted and deformed, causing serious defoliation. Brown spots appeared in the early stage of young fruit damage, and gradually expanded and turned into yellowish brown, conical, corky tumor-like processes, forming many scattered or mass tumor processes, resulting in fruit dysplasia and deformity, resulting in fruit drop in the early stage and poor fruit quality in the later stage. I planted a pot of golden marbles, there has been a prominent black block on the back of the leaves, may be scab, used "chlorothalonil" and "topiramate" have not been effective, how to prevent and cure? The following flowers and grass music to share with you:

The leaves of golden marbles have prominent black blocks, how to prevent and cure suspected scab

Prevention and treatment of golden marble scab

First, from late autumn to early spring, the diseased leaves falling from the plant should be burned; the diseased leaves with diseased spots should also be cut off and burned; because they are evergreen or semi-evergreen shrubs, the pathogens of disease in the coming year can be greatly reduced by destroying diseased leaves.

2. during the overwintering period, 0.5 Baume stone-sulfur mixture solution is applied on the tree trunk, or it can be dissolved and diluted with the stone-sulfur mixture crystal purchased by the pesticide store. If the leaves have all fallen, the whole plant can be sprayed with tartar-sulfur mixture, but do not let the solution infiltrate into the basin soil, because the liquid is alkaline and easy to burn nutritious roots, you can cover the basin soil with a layer of plastic film before spraying, which can not only effectively kill the mycelium or conidia hidden in the branches overwintering, but also prevent the liquid from infiltrating into the basin soil.

Third, the disease began to occur in May, and the peak period is from July to September. The bacteria like the wet environment, and the disease is serious in the damp leeward. Therefore, a ventilated, transparent, dry and cool environment should be created for the disease: starting from the extraction of new leaves, spraying 50% carbendazim wettable powder 500 times every semimonthly can prevent infection. Fourth, if there are a small number of diseased leaves, they should be picked and burned as soon as possible, and at the same time, use 70% Dysen zinc wettable powder 800x solution, or 70% methyl topiramate wettable powder 1000 times liquid, every half a month, 3 to 4 times in a row; note that pesticides must be purchased at reputable drugstores and must be placed in a low temperature and dark place to avoid decomposition failure. The "chlorothalonil" and "topiramate" you mentioned are invalid, which may be related to the poor preservation and impure quality of pesticides.

Daily maintenance of golden marbles to prevent the occurrence of diseases and insect pests in advance. Golden marbles are positive trees with exuberant growth, strong adaptability and no choice of soil. It can grow in acidic, alkaline and neutral soil, and can blossom and bear fruit. Golden marbles are resistant to drought and high temperature, cold and dampness, and keep bonsai on an unsheltered roof platform. [view details]

Time: 2019-04-24 Click: