Occurrence and control of jujube slime worm
Date slime worm belongs to lepidoptera, small leaf tortilla family. Common name sticky leaf insect, stick leaf insect, leaf curl insect etc. It is one of the main pests of jujube trees in China.
I. Damage characteristics
The jujube slime worm damages buds, leaves, buds, flowers and fruits by spinning silk. Especially the third generation larvae are in the fruit coloring stage, often stick jujube leaves and jujube fruits with thin silk, nibble jujube skin and jujube flesh at the fruit stalk, resulting in a large number of fruit drops and rotten fruits.
II. Living habits
In Shandong and Hebei, three generations can occur in a year. The overwintering generation began to emerge and lay eggs in the middle and late March, and the first generation larvae hatched in the first and middle April and began to harm the jujube buds. The damage peak of the second generation larvae occurred in the middle of June and lasted to the first ten days of July (flowering and fruiting stage). The damage peak of the third generation larvae was from the end of August to the first ten days of September, and could last to the middle of September. Then the mature larvae gradually transferred to the thick skin crevice cocoon pupation winter. The second and third generation larvae hatch irregularly and overlap generation, which brings great difficulty to control. All generations of larvae are silking, connecting flowers and leaves, leaves and hanging, leaves and fruits, hidden in which damage, resulting in flower drop, fruit drop, rotten fruit.
III. Prevention and control methods
In addition to physical and biological measures such as scraping bark to kill pupae, trapping adults with insecticidal lamps, releasing Trichogramma in jujube gardens and spraying BT biological pesticides in spring, chemical control is the key.
In winter jujube orchard, the first generation larvae can be combined with the control of Lygus lucorum and other pests, without additional control. Most of the larvae of the second generation can also be controlled in controlling red spiders and other pests, but due to the overlapping characteristics of the second and third generations, spraying should be done once in late July or early August. Especially the key is the occurrence and harm of the third generation. It is necessary to spray 2-3 times continuously from late August to early September, so as to achieve thorough control, otherwise a large number of losses will be caused to jujube fruit.
The medicament selection includes: 1200 times of Wod Ying, 1500 times of Qigong, 1500 times of insect resistance, 1500 times of methylamino abamectin benzoate + high chlorine or kung fu.
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Dangshan pear
Originated in Dangshan, Anhui Province. Cultivated in Shanxi, Shaanxi, * * and Yunnan, with excellent quality. It is an excellent variety with high quality and high yield with strong adaptability in China. The fruit is large, with an average weight of 238.7 grams per fruit. The fruit is oblong. Fruiting pedicel medium long, sepals deciduous. The pericarp is green and yellow and becomes yellowish after storage. The flesh is white, the core is small, the meat is thicker, crisp, juicy and sweet. Contains 12.4% soluble solids, 7.35% soluble sugar, 0.1% titratable acid and 2.21 mg / 100 g vitamin C. Quality
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Occurrence and control of fruit shrinkage disease of jujube
First, symptoms and harm jujube fruit shrinkage disease, also known as jujube wilt fruit disease, jujube fog wilt disease, is one of the main diseases in major jujube areas in China. The jujube fruit with fruit shrinkage disease first appeared yellowish brown irregular discoloration spots on the shoulder or carcass, and then the pericarp appeared waterlogged, khaki, the edge was unclear, and in the later stage, the pericarp became dark red, contracted, and had no luster. Brown spots appear in the pulp disease area from outside to inside, and the flesh is yellow and soft. The sick fruit tastes bitter. The fruiting stalk becomes brown or dark brown. The whole diseased fruit is thin and falls off before ripening.
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