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 infect the roots and leaves of Phalaenopsis plants, causing root rot or leaf soft rot. The initial symptoms on the seedlings are not easy to distinguish from soft rot or blight in appearance, but the white mycelium peculiar to white silk disease will grow on the damaged site and substrate before long, and then turn to brown sclerotia particles. The preventive measures are as follows:
(1) do not use unsterilized old seedling plates and substrates.
(2) clean up other hosts and do a good job in the environmental hygiene of Orchid Garden.
(3) inspect the garden, pick up diseased plants and leaves, remove and burn them.
(4) when the disease is frequent, it can be sprayed with 50% Fodonine or 75% metoprolol wettable powder.
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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. It can spray 65% Dysen zinc wettable powder 600 times liquid and 75% chlorothalonil wettability at the time of onset.
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Cultivation and propagation of rhododendron red camellia
Rhododendron red camellia, also known as rhododendron tea, or "fake big head tea", belongs to the genus Camellia and is a small evergreen tree. It is named because it looks very much like a cuckoo, but it is actually camellia. Rhododendron red camellia is an extremely rare variety of camellia, which is only found in Ehuangzhang Provincial Nature Reserve in Yangchun County, Guangdong Province. Ordinary camellia has both proud plum style and gorgeous peonies. It has been a very famous woody flower since ancient times and has the reputation of "world famous flower". The beauty of rhododendron red camellia is better than that of ordinary camellia.
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