How to control Botrytis cinerea of rose
Botrytis cinerea mainly harms flowers and twigs. After the bud is infected, it is waterlogged and irregular at first, and the spot expands continuously, so that the whole bud becomes soft and rotten. When the diseased buds wither and hang on the diseased tissue, the pathogen will also invade the branches that have been picked flowers, and a large number of gray mildew layers will be produced in the disease under warm and humid conditions.
Prevention and control measures 1. Timely removal of diseased flowers, removal of withered presbyopia, and concentrated burning. two。 Greenhouse cultivation should pay attention to ventilation and avoid excessive humidity. 3. During the onset of the disease, 65% Dysen zinc wettable powder, 75% chlorothalonil wettable powder or 70% methyl topiramate wettable powder 1500 times can be sprayed.
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Correct use of ethephon when cotton matures late this year
This year, due to the influence of low temperature, overcast and rain, cotton production in northern China has led to late sowing and emergence of spring cotton in a large area, and the budding and flowering period has been delayed by about 7 days than usual, and the cotton bolting maturity will also be delayed by more than a week. In addition, there are more overcast and rainy weather in North China from late August to early September, cotton is prone to greedy green late ripening phenomenon. Therefore, measures to promote early maturity are particularly important in the late management of cotton fields this year. Years of practice shows that the correct use of ethephon to accelerate ripening in late-maturing cotton fields is simple and easy to do and increase production.
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Prevention and Control of White Silk Disease of Cymbidium
White silk disease is caused by fungus Selerotiumrolfsii, which harms seedlings to the base and roots of adult stems. Cymbidium is more likely to be infected with the disease. During the disease, white hyphae can be seen at the base of the stem, browning at the base of the stem, root drying, and the formation of a large number of small brown sclerotia, resulting in the softening of the stem base and death. The pathogen has a wide host range and does serious harm to bulbous flowers and perennial flowers. And it has strong saprophytic nature and can survive in the matrix or old basin for a long time by sclerotia. This pathogen can also be infected with cymbidium.
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