Blackout greenhouse ,Light dep greenhouse ,Auto light deprivation greenhouse,Blackout green house,film greenhouse JIANGSU SKYPLAN GREENHOUSE TECHNOLOGY CO.,LTD , https://www.greenhousehydroponic.com
Xu Mingju said that a large number of defoliants in apple trees are a new disease caused by anthrax pathogens. Fruit plant protection experts referred to them as "an apple anthrax blight", "apple blight" and "apple anthrax blight". The disease-causing bacteria are called "Bacteria anthracnose", and the major damages are the cracks, gold, and Jonagold.
According to Xu Mingju, a large number of observations in the field revealed that the initial symptoms of apple leaf blight were black necrosis and spots with blurred edges. Under conditions of high temperature and high humidity, the lesions spread rapidly and spread to the entire leaf within one or two days. The leaves become black and necrotic. After the diseased leaves lose water, they appear scorch and then fall off. When the environmental conditions are unsuitable, the lesions stop expanding and form dead and dead patches of varying sizes on the leaves. The healthy tissue surrounding the lesions then turns yellow, and the diseased leaves quickly fall off. When the lesions are small and numerous, the symptoms of the diseased leaves resemble the symptoms of brown spot disease. The bacteria will infect the fruit and form a circular necrotic spot with a diameter of 2 to 3 mm. The lesion is concave and there are red halos surrounding it.
Apple anthracnose leaf blight began as early as July, the peak incidence mainly in July-August continuous rainy season. Because leaf blight is mainly involved in the onset of infection during rainfall, the onset of infection requires a higher temperature, the incubation period is short and the incidence is acute after the infection. The triazole bactericidal agent is not effective against the disease, and the infected fruit tree is generally from July 15 A large number of fallen leaves began on the day and a large area exploded. According to plant protection expert experiments, Bordeaux mixture, zesin zinc and mancozeb have better prevention and treatment of the disease.
Xu Mingju also suggested that since mid-June, fruit growers can alternately spray Bordeaux mixture and dexsen (80% fully-complexed mancozeb), or use 77% Donning 800X, 80% Proxon 600 Double fluid. Every 10-15 days, medication before the rain. To ensure that each time there is more than 2 days of continuous rain, the leaves and branches are in the protection of the drug. If there is no timely spraying before the rain, the fruit grower can spray the mancozeb, Bordeaux mixture or other related agents in the intermittent interval of continuous rain. For example, Pyrazopram has a certain systemic therapeutic effect, and it can last for up to 10 days in the absence of rain. Prochloraz has a certain therapeutic effect. Therefore, it is available for selection.
In addition, the orchards should pay attention to drainage in the rainy season to prevent the orchards from accumulating water for a long time. If the garden is covered with a plastic film, it can prevent the rain from splashing on the ground. Orchard growing grass can also improve the growth environment of fruit trees and improve disease resistance of fruit trees. The timely implementation of orchards in summer pruning, cutting off over dense branches, open the light, improve the orchard ventilation conditions, but also reduce the incidence of pests.
In addition to these measures that can be quickly adopted, it is also necessary for farmers who have aspiration to build gardens to lay aside in advance. The new park should not only try to choose fruit trees that are not susceptible to disease, but also implement ridge cultivation. For the old garden, the future will be to completely clean up the orchard, clean up the fallen leaves, scrape the branches and destroy pathogens. Spraying functional liquid fertilizers to strengthen tree vigor and improve disease resistance of trees. To eradicate the overwintering germs even more, when the orchards shed a lot of leaves in October, spray 200 times of copper sulfate solution + 400 times of polypeptin protein solution; before the apple germination in April the following year, apply 200 times more copper sulfate. Liquid + polypeptide protein solution 400 times, or other strong killing eradication agent to eradicate the wintering bacteria on shoots and dormant buds.
In the past two years, the fruit growers in the province such as Jin Shuai and Dora have often encountered a problem. By July and August, Apple was not familiar and the leaves had fallen. Experts from the fruit innovation team of Shandong Province, head of the fruit and vegetable video network, and Xu Mingju, director of the Feixian Fruit Research Institute, said that in the early fall leaves, it is easy to make people feel alarmed, and some fruit growers have not figured out how it happened. The use of fungicides together did not work.