Control methods of diseases and insect pests of purple leaf dwarf cherry

1. Disease control methods.

It is necessary to strictly inspect the system, do a good inspection before the seedlings are transported, destroy the trees as soon as root cancer is found, and thoroughly disinfect the sites where diseased trees are planted with drugs such as quicklime or bleach, and do not plant saplings in the disinfected soil within a week.

The saplings that are initially infected with the disease can use a knife to remove the diseased site, and then smear the wound with drugs such as lime milk to prevent the disease.

If it is a grown trunk, once suffering from root cancer, penicillin, streptomycin and oxytetracycline can be subcutaneously injected or soaked in roots, which has a significant therapeutic effect on root cancer.

Saplings that are not sure whether they are infected by root cancer bacteria can be soaked in 1% copper sulfate solution before planting, rinse with clean water five minutes later and then plant.

2. Insect pests.

In view of insect pests, the trunks and branches of purple cherry trees can be whitened every year when overwintering, and the eggs and cocoons can be removed at the same time. When trees grow in early spring, fungicides such as chlorothalonil and carbendazim should be sprayed in time to prevent pests. Diamondback moths, aphids, leaf hoppers and scale insects can be sprayed with deltamethrin, and red spiders can be controlled with triclofenac.

Control of main Diseases and insect pests of Purple Leaf Dwarf Sakura

In the process of cultivation, purple leaf dwarf cherry will be harmed by diamondback moth, aphids, red spiders, leaf hoppers and scale insects. Try to whiten the trunk and branches every winter, scrape the eggs and cocoons clean, and spray chlorothalonil, carbendazim and other broad-spectrum fungicides in early spring.

If the disease occurs, it should be treated in time, such as diamondback moth, aphids, leaf hoppers and scale insects can be sprayed with deltamethrin, and red spiders can be controlled with triclofenac.

Opinions on Disease and insect Pest Control and safe use of Flower seedlings in Summer

At present, it has entered the midsummer season, which is the peak season and the key period for the prevention and control of diseases and insect pests of flowers and seedlings in our district.

I. occurrence of main pests in flower seedlings

1. The third generation of Spodoptera litura and Spodoptera exigua, these two pests have miscellaneous food habits, a wide range of hazards and overeating. Especially in the case of drought, the harm is the most serious. According to the observation of sex attractants on July 14, the peak on July 16 (the number of sex attractants, 52 Spodoptera litura and 12 Spodoptera exigua) flourished for four consecutive days from 16 to 19 July. 174 Spodoptera litura and 35 Spodoptera exigua were investigated on July 21. Spodoptera litura has eggs on red leaf plum, horseshoe, clover and other crops. And young larvae. The highest point is one square meter of clover with 28 young larvae and one egg. According to the investigation of beet armyworm on Platycladus orientalis and Sabina vulgaris seedlings, it has been found that the larvae are harmful, and the highest point is 3 young larvae per square meter. It is predicted that the two insects will occur in late July and early August. It mainly harms many kinds of herbaceous flowers and seedlings, such as red-leaf plum, Dichondra repens, clover, purple-leaf dwarf cherry, yellow poplar, Platycladus orientalis, cypress seedlings and so on.

2. According to the observation of the second generation of diamondback moth, the number of yellow diamondback moth and flat diamondback moth began to rise on July 11, and the first peak appeared on July 18. It is predicted that the peak period of moth will last until the first ten days of August, and the harm of low-instar larvae will occur at the same time. The main harmful crops are poplar, willow, elm, pear, begonia, magnolia and other seedlings.

3. Mites: red spiders rose slowly when they were scoured by Rain Water in the early stage. Investigation on July 21 showed that Populus tomentosa, sweet-scented osmanthus, Firethorn, dragon cypress, rose and other crops all occurred, and the rate of mites was 8mur13%. Recently, it has entered the high temperature and midsummer. If drought and reproduction are accelerated, it is bound to spread rapidly.

4. Net bug. There are mainly tea wing bug, pear crown net bug, bright crown net bug and so on, which are harmful to cloves, begonia, elm, mulberry, cherry blossom, peach, pear, rhododendron, firethorn and other crops, especially from July to August.

5. Leaf roll moth (small leaf roll moth, back yellow leaf moth). It is reported that the moth has risen under the lamp, entered the peak period on July 11, and reached a peak on July 20, and the larval damage reached its peak at the end of July, which mainly harmed many crops such as water wax, yellow poplar, plum, pomegranate and other crops, and the larvae harmed tender leaves, flower buds and young fruits. Larvae generally gnaw on rolled leaves or two overlapping leaves close to the fruit surface.

Second, safe use of pesticides.

Biological pesticides and pesticides with high efficiency, low toxicity and low residue should be popularized in the prevention and control of insect pests in flowers and seedlings.

The main results are as follows: 1. Moth pests can be controlled from the peak egg hatching period to the peak period of young instar larvae, and the insecticides are selected: 1. Each liter contains 12 billion Bt120 times of bacterial spores. 2. 20% full suspension agent 1000 times. 3. 24% Maiman suspension 3000 times. 4. 40% chlorpyrifos 800 times. 5. Aolu No. 1 800 times. 6.5% Yitaibao EC 1000 times.

2. Mites control agents: 1.8% avermectin EC 2500 times or 15% up to 2500 times.

3, control net bug medicament: can choose 10% imidacloprid 2000 times or 40% acephate 1000 times.

Matters needing attention: depending on the development of the insect, every 5 murals is isolated for 7 days, and 2 Murray is treated continuously for 3 times. When spraying, enough liquid should be sprayed to ensure the control effect, and at the same time, attention should be paid to the rotational use of chemicals to improve the efficacy and delay the resistance. at present, it is in the high temperature season, so the medicine should be used in the evening and do not blindly increase the concentration of the drug.