The red spider of rhododendron
The female adult is about 0.3 mm long, dark red, nearly oval, the back of the body is raised, 4 pairs of dark red; the male adult is 0.25 mm long, cuneate, flattened bright red. The adults overwintered in the root of the plant, mainly near the main vein of the petiole on the back of the leaf, propagated rapidly in high temperature, less rain and drought weather from June to July, and the damaged leaves were scorched and shedded when the damage was serious.
Prevention and control methods: manual control, regular inspection after April, when it is found that individual leaves have red spiders, the leaves can be burned in time. Conditional natural enemies such as ladybugs, lacewings and thrips can be released artificially for biological control. If more leaves are found to have red spiders, chemical control can be carried out, such as spraying 40% dicofol 800 to 1000 times, which has a strong killing effect on adults, nymphs, larvae and eggs, as long as the uniform effect of spraying is good.
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Reasonable Flower and Fruit thinning to promote stable and High yield of Waxberry
The main fruit of red bayberry is short and medium fruit branches. Because only the terminal buds of these two types of fruiting branches are leaf buds, and the rest are mostly differentiated into flower buds, if they are allowed to bear fruit naturally, the fruit is often excessive, small and poor in quality, and it is easy to cause large and small years, so fruit thinning should be carried out in order to achieve stable and high yield. The fruit thinning period of ⑴ usually takes place in the middle and late April before the rapid expansion of the fruit after setting the fruit. In ⑵ fruit thinning method, 3 fruits were left in every 6 fruit branches, 3 fruit branches were removed, and 2 fruits were left in each fruit branch. The principle of ⑶ fruit thinning is that the upper part of the crown leaves less and the lower part of the crown.
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Forage: The main cultivation techniques of European chicory
[Soil preparation and fertilization] Because chicory seeds are small (1000-grain weight is 0.96 g), the soil surface should be finely divided and leveled on the basis of deep ploughing. At the same time, sufficient manure should be applied to 2500~3000 kg per mu. [Sowing] ① Sowing time: chicory is perennial, so the sowing time is not limited by the season, generally from April to October can be sown, above 5 degrees Celsius can be sown.② Sowing quantity: Chicory seeds are fine, sowing quantity is generally 400 g ~500 g per mu, breeding mu
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