It can happen in all seasons of the year. High temperature and rainy seasons are common.
The disease spots spread from the tip of the leaves to the rhizome. At first, they were brown, and then gradually increased. There were many dry black spots. In serious cases, the plants died.
If any diseased leaf or plant is found, it shall be cut or pulled out in time and burned.
Spray 700 times of 50% carbendazim wettable powder or 600 times of 40% polysulfide suspension once every 7-10 days at the initial stage of the disease, and control 3-4 times continuously.
Leaf blight usually starts in June, and occurs in warm and rainy years and seasons, which endangers the growth of P. lanceolata.
The pathogen survived through the winter with mycelium and sporoderm in the diseased leaves and the diseased remains, and produced conidia which were transmitted by wind and rain.
Part of the damaged needles became gray brown, and finally became gray white and dry, with dense black grains on them.
When selecting plants, we should select disease-free plants.
Pay attention to the drainage of the soil to avoid over planting.
It can spray 600 times of 40% polysulfide gel suspension, 600 times of 30% cupric oxychloride gel suspension, 8000 times of 25% NbZ emulsion, 8000 times of 40% flusilazole emulsion, 1500 times of 50% methylonium water agent, 1500 times of 69% Anke manganese zinc and 75% chlorothalonil wettable powder, or 600 times of 65% doxycycline wettable powder.
Commonly known as "blue lice", in the high temperature and high humidity "the air is not circulating in the situation of the fastest reproduction.
It will suck the sap from the leaves of the Chinese fir, causing the leaves to fall off, the plants to grow slowly and die in serious cases.
1% Omethoate or 1500 times 50% malathion were used in the incubation period.
If the number of scale insects is small in the family culture of Taxus chinensis, they can be removed manually.
