How to manage Robinia pseudoacacia seedlings?
The management method of Robinia pseudoacacia seedling stage is as follows: the first seedling is carried out when the seedling height is 3 to 4 cm, and then 1 or 2 times according to the seedling growth, and the last seedling is carried out when the seedling height is 10 to 15 cm. After fixing the seedlings, there are about 10,000 plants per mu. Robinia pseudoacacia is afraid of waterlogging and should be drained in time after heavy rain. After 3 or 4 true leaves of the seedlings, chemical fertilizer was applied once and again in July, and generally no longer irrigated and fertilized after August.
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What is the occurrence regularity of Robinia pseudoacacia (Plutella xylostella)?
The occurrence regularity of Robinia pseudoacacia (Plutella xylostella): one generation a year occurs in Hebei, Shandong, Jiangsu, Anhui and other places, and the mature larvae drill into the soil 10 to 15 cm deep to overwinter. Pupation began in the first and middle June of the following year. The pupal stage ranges from 10 to 15 days. The adult Eclosion occurred in the first and middle of July, and the peak of emergence was in the middle of July. The adults lie still in the branches and leaves during the day and begin to move in the evening, and the adults have phototaxis. Generally, eggs begin to lay eggs 3 hours after mating, and the eggs are mostly laid on the back of the leaves and a few on the front. The average number of eggs laid by each female is about 350. Adults 7 to 10
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Tillering Regeneration technique of Robinia pseudoacacia
1. After the clear cutting of Robinia pseudoacacia, the accumulation of a large number of residues and shrub weeds on the site are the obstacles to sprouting and regeneration, which should be cleared in time. The main purpose is to improve site conditions and sanitary conditions, to create a favorable environment for the growth of young trees, and to promote the closure of young forests as soon as possible. two。 In order to shorten the period of forest cultivation, comprehensive closure measures were taken for the felling sites of Robinia pseudoacacia. Cattle and sheep specially nibble on the tender shoots of young trees, which do great harm to the sprouting of Robinia pseudoacacia. Special personnel should be set up to supervise and protect them, and grazing should be strictly prohibited. Cutting grass and collecting firewood are strictly prohibited.
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