Cypermethrin
It is a synthetic pyrethroid used as an insecticide in large-scale commercial agricultural applications as
well as in consumer products for domestic purposes. It behaves as a fast-acting neurotoxin in insects. It is easily degraded on soil and plants but can be
effective for weeks when applied to indoor inert surfaces. Exposure to
sunlight, water and oxygen will accelerate its decomposition. Cypermethrin is
highly toxic to fish, bees and aquatic insects, according to the National
Pesticides Telecommunications Network (NPTN). It is found in many household ant and cockroach killers,
including Raid and ant chalk.
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First, high contact
1, long high contact. Choose pears that grow vigorously for more than 4 years and use the adaptable and stress-tolerant pear tree as the basic anvil for grafting. Use the near stem and near branch to carry out high grafting. The grafting method is based on pod grafting to restore the crown as soon as possible. Objectives: More than 50 scions per tree height, each scion requires 3–4 full shoots.
2. Borrow the result. In the process of long high grafting, grafted vegetative shoots are mainly used. In order to ensure yield, flower buds should be appropriately supplemented. The number of flower buds should be 1/3, and each scion should have 2 full and intact flower buds.
3, configuration pollination tree. Early pears have low self-cultivation rate, and they need to be equipped with pollination varieties in order to achieve normal results. The pollination tree needs to be able to pollinate with the early pear, and the flowering period is the same. The pollen amount is large and the quality is good. The number of pollinated trees accounts for 1/4. it is good. The early crisp pollination varieties include Laoshan, New Century, and unknown body.
Second, after the management
1, pull the sticks. The results of grafted survival of early pear were lighter and the growth was stronger. Because the top of the pear tree had obvious advantages and strong growth polarity, most grafted shoots grew upright and needed to be reshaped. The optimum time for pulling the branches is generally around July, when the growth of the branches is more than 40cm, and the requirement for pulling branches is reached, and the branches have not been lignified, and the setting effect of pulling branches is obvious. As early as the pear branches are soft and easy to draw, they can be shaped by pulling ropes, supporting branches, back sticks and hanging objects.
2, tips. Early Pear pears have a high germination rate, but the rate of branching is low, especially for shoots that have high survival rates. Most of them do not see large branches and do not need branches. When the branches grow to 40cm, they can pick up their hearts, and the branches below 40cm can be thrown away. If the effect of picking the tips is not obvious, it can be used to pick up the heart twice.
3, to promote flowers. As early as Pear-Pear branches to promote the effect of flowering is better, in addition to pulling branches to promote the heart, in addition to the strong growth of branches and excessive branches can also use twisted branches, tips to promote the method of flower; early pear branches soft and twist Shoots on the branches will destroy the structure of the xylem and are not suitable for permanent sticks, so as not to weaken the bearing capacity of the branches.
4, fertilizer and water management. Early Pear is a early-fruiting fruit tree, which requires relatively high requirements for fertilizer and water. Artificial irrigation is required to preserve the fruit. The critical period of irrigation is pre-flowering, post-flowering and fruit rapid expansion, and where conditions permit, ground cover can be used. The method of water conservation. As early pears have a large amount of fruit, a short growth period, and a large amount of concentrated nutrients, in the annual management of fertilization, basal fertilizer and strong fruit fertilizer are the key to high yield in successive years. Pay attention to increase the organic fertilizer, according to the requirements of pound fruit fertilizer in the autumn when the base fertilizer is applied deep-groove method to apply high-quality organic fertilizer. Promote formula fertilization, in the flower before the fertilizer, post-fertilizer, strong fruit fertilizer and fruit fertilizer, the ratio of nitrogen, phosphorus and potassium to be properly matched, appropriate to add trace elements to meet the results of fruit tree growth requirements of various nutrients.
Agricultural
High-Planting High-yielding Cultivation Techniques of Early Crisp Pear
The early crisp pears are tender, crisp and slag, sweet and juicy, with a small fruit core. They can be listed in the Kunming area by the end of June and are excellent early maturing varieties. Early Pear has a high germination rate, a low rate of branching, a relatively loose canopy, and vigorous growth of young trees, which slows down after entering the result period. Early Pear pears have relatively high requirements for fertilizer and water. Extensively managed orchards are characterized by fewer leaves and leaves, too many fruit set, small fruit, and premature aging of tree vigor. Once the tree vigor is weak, it is difficult to recover. In order to guarantee the correctness of the early pear tree, the following methods can be used for cultivation.
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