Injury yellow, leeks, onions, lilies, loquats, beets, potatoes, Gladiolus, Pinellia, Fritillaria and so on.
The characteristics of the damage?? The victim's underground stem or bulb was dark brown and corrupt, the damage with the root proliferated continuously spread to the surrounding and internal tissue depth, resulting in the upper part of the leaves are small, yellow, slow growth, and even withered. Onion seedlings are the first to suffer withered leaves, decolorization symptoms, serious light blue tissue damage, dull, broken. Lily and other bulbs suffered damage, resulting in small brown spots, and dried up above ground. Some vegetable or flower bulbs suffer damage. After germination the leaves are purple and gradually dry. Should pay attention to the difference with the disease.
Morphological characteristics: Adult broad-oval, body length 0.6 ~ 0.9 mm, milky, shiny, E body, foot light red brown, larvae 3 pairs of feet, nymphs and adults 4 pairs. Egg white, oval, about 0.2 mm long.
Habits of life?? Chengyu and Ruoqiang damage Leek, garlic false stems to make it rot. Under high-humidity conditions, it took 17 to 27 days to complete one generation at 18.3 to 23.9°C, only 9 to 13 days at 20 to 26.7°C, and spawned at 1 to 3 days after mating, with an average of 195 per female. Up to 500 tablets. When the conditions of the first and third seasons were unfavorable, there was a moving body with a smaller body size. Japan is more than 10 generations old. The prostitutes rooted in sandy soil. Sometimes onion can reach hundreds of heads. There are more than 10 roots on one root that can move in the earth. Acid soil is heavy.
The law of occurrence?
Control methods??
1. Pay attention to deep plowing and reasonable fertilization during soil preparation. Apply slaked lime 80 to 100 kg to neutral soil.
2, a reasonable rotation, to avoid continuous cropping of the host crop, and melons, beans rotation.
3, root crops in the sun exposure can reduce the damage. ]
4, control of transplanting period? Buy or choose to use insect-free seedlings, strictly eliminate the insect seedlings. Before inserting, dip 20% net emulsion or 50% Nisone EC 2000~3000 times liquid dip root 5 ~ 10min, killing effect of up to 90%.
5, the adult stage of chemical control can be used 48% Le Siben EC, 20% Ke Ke EC, 1.8% Cumulong EC, 20% broom net EC 1000 ~ 1500 times liquid injection on the green onion base, control effect reached More than 80%.
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