Control techniques of yellow poplar inchworm
First, the harm: silk cotton, yellow poplar, Wei spear, elm, poplar, willow and so on. The larvae gather the leaves to feed, eat up the leaves and eat the skin of the twigs, resulting in the death of the whole plant.
Second, the law of occurrence: there are 3 generations of 2murs a year, overwintering as pupae. Adults inhabit hidden places of branches and leaves during the day, move at night, mate, and lay eggs on the back of the leaves, arranged in double rows or blocks. There are dozens to more than a hundred eggs. Most of the eggs hatched at 5: 00 in the morning, the leaves were harmed, the skins were eaten, and the mature larvae fell into the soil and pupated. The flying ability of adults is not strong and has strong phototaxis.
III. Prevention and control methods
The main results are as follows: 1. During the emergence period of adults, light is used to trap and kill them.
2. Make use of the characteristics that the flying ability of adults is not strong and concentrate on the upper and lower parts of parasitic plants in the morning and evening, they are hunted and killed with simple instruments.
3. During the peak period of adult oviposition, the egg mass and newly hatched larvae on the weeds around the rhizosphere are removed, and the overwintering pupae can be killed by ploughing the rhizosphere soil in winter.
4. During the larval damage period, spraying 50% imidathion emulsion 200 times, 50% fenitrothion EC 500 times, and 25% carbaryl wettable powder 300 times 500 times, the control effect is better.
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The most common diseases and insect pests of Populus tomentosa
1. The yellow poplar silk leaf borer larva spun silk to connect the surrounding leaves and twigs as temporary nests, and then ate up the leaves in serious cases, resulting in the death of seedlings. Morphological features: adult body wings are gray-white, the front, outer and trailing edges of the wings are purple-brown wide band, there are two white spots on the leading edge of the purplish brown belt, the scales are shiny, and the purplish red shines. The head of the larva is black, the carcass is yellowish green, the topline, subtopline and valve line are dark green to dark green, and the valve line is orange. Occurrence regularity: 2 to 3 generations a year in the northern region, with larvae in
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Cultivation techniques of Populus tomentosa
Populus tomentosa, also known as Populus tomentosa, has numerous branches and leaves. Leaves are whorled with three leaves, which are large, medium and small, all of which are long oval, leathery, thick and shiny. Populus tomentosa is an evergreen shrub or tree, belonging to 6 genera and 30 species of Populus tomentosa. It has strong and fine wood and produces temperate and subtropical mountains of Jiangsu, Zhejiang and Anhui in China. Summer boxwood branches with small yellowish flowers, apetalous flowers with a light pink fragrance, flowers in clusters at the top, showing umbels, bearing fruit after anthesis, one seed per fruit. Most of the reproduction is seed sowing, because it is difficult to grow up, so more cropping
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