How to control the diseases of calla lilies
The main pests that harm calla lilies are: two-point spider mite, that is, cotton spider mite and cotton red spider. The back of female mite is oval, the back of male is rhombus, the color is yellow and yellowish green in spring and summer, there is a black patch on each side, and the body color becomes orange at the end of summer, and the number of female increases in late autumn. The eggs laid by the female are colorless, transparent and spherical, and then turn orange-red; the young mites are reddish oval. Tetranychus urticae generally overwintered as females and nymphs on the surface of stems, soil and the roots of rural weeds, and began to be active from late March to early April in the second year, and harmed from early May to early October. Prevention and control measures: 1. Timely removal of diseased leaves and concentrated burning; 2. Spray 1000 times of dicofol, 2000 times of good winter, or 1500 times of Icas regularly.
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Common diseases of poplar in spring
Poplar canker mainly occurred in the process of seedling transplantation. the disease began in late March, peaked from mid-April to late May, stopped at the beginning of June, and developed slightly after October. The disease can infect tree trunks, rhizomes and branches of big trees, but mainly harms the middle and lower parts of the trunk. It appeared near the lenticels of the trunk in the early stage of the disease.
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Key points of horseshoe cultivation techniques
1. Variety selection should be made from high-yield and disease-free horseshoe fields, with complete appearance, disease-free wounds, full corms and strong bud heads as seeds, with a size of less than 30 per jin and 120 tons and 150 jin per mu. Second, soak the seeds for 10 hours with 800 times before raising seedlings to prevent stem blight and seedlings.
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