What if there are worms on the back of cuckoo leaves?
(1) red spider. The individual is very small, the body length is generally about 0.3 mm, it is difficult to see clearly with the naked eye, observation needs the help of a magnifying glass. Red body, often gathered on the back of the leaves, mainly absorb the sap of the plant, and make the leaves appear gray-white spots. In serious cases, the leaves turn yellow and fall off, the growth of new shoots is poor, and the tree potential is weakened. Red spiders produce 10 generations a year, and the harm is particularly serious in high temperature and drought from June to August, but less harmful in heavy rain and rainy weather. Withered branches and leaves should be removed in winter to eliminate overwintering adults. When damage begins in March, 1000 times of Uranus EC, 7051 times of insecticide (3000 times of insecticidal) or 1000 times of pyridazinone (acarone) should be sprayed.
(2) Pear net bug, also known as military worm. The adult of pear net bug is gray-white, winged and flat. Often clustered in the back of the leaf to absorb juice, so that the leaf color becomes yellowish brown, or even white, the back of the leaf has a yellowish-brown spot formed by secretions, causing early defoliation, affecting growth and ornamental. The harmful period of pear net bug is from May to October, which occurs more frequently in summer and autumn, especially in August when the weather is dry. The fallen leaves should be removed and the number of overwintering insects should be reduced. When the first generation larvae occur in the first and middle of May, 40% omethoate EC 1500 times or insecticidal 2000 times solution can be sprayed.
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Rhododendron leaf swelling disease
Symptoms: rhododendron leaf swelling disease is also called cake disease. The young tissues of rhododendron can be damaged, mainly for flower buds, tender leaves and new shoots. The front of the leaf is a light yellow translucent round spot at first, then yellow, sunken; the back of the leaf is reddish, hypertrophic and swollen, followed by a gall tumor, and there is a thick gray-white powder layer on the surface of the gall tumor, such as biscuit-like, withered, yellow and early fallen leaves. In severe cases, the petiole disease is patchy and deformed and hypertrophy. When the tender shoot is sick, the top produces a fleshy lotus-shaped leaf, or a tumor-like leaf, and then shrinks into a sac. After the petals are infected, they are abnormally thick and show irregular galls.
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Why did the cuckoo lose its leaves?
There are about ten reasons why rhododendrons lose their leaves due to disease: ▲ hypertrophy, burning roots and dry tips. The ▲ floods the roots and leaves. ▲ overcooled or overheated water ▲ soil is alkaline and hardened. ▲ suffers from black spot disease with high humidity. ▲ red spider disease. There is a tumor at the edge of the lobe of ▲. ▲ leaves the room too early, too late, or poorly ventilated. ▲ is too dry. ▲ is damaged by paint or other toxic fumes.
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