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What are the morphological characteristics, damage features, and living habits of the jujube mealybug?
The adult jujube mealybug is flat and oval, with a body length of about 2.5 cm, a slightly raised back, densely covered with white waxy powder, needle-like waxy structures along the body margin, and a pair of exceptionally long waxy tail bristles at the rear. The nymph is flat and oval, with well-developed legs that are brown. The egg is oval, composed of white waxy flocculent material. The jujube mealybug has 3 generations per year, overwinters as nymphs in bark crevices, begins activity in April, lays eggs in early May, with an egg period of 9-10 days. The peak occurrence periods of nymphs for each generation are early June, mid-July, and mid-September. Mass overwintering begins in early October.
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What are the damage characteristics and living habits of the jujube leaf mite?
The jujube leaf mite is commonly known as gray leaf disease, fog disease, fire dragon, etc. It damages the leaves, flowers, and fruits of jujube trees as adults and nymphs. The damaged leaves turn grayish-white, the mesophyll thickens and becomes brittle; in severe cases, the leaf epidermal cells necrose, losing photosynthetic capacity, and the leaves curl and drop easily. Damaged flower calyces cannot bloom. The jujube leaf mite produces more than 3 generations per year, overwintering as adults or nymphs within the bud scales of jujube spurs. This pest has three damage peaks per year, namely late April, late June, and mid-July, each lasting 10-15 days. It begins in early August
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