What are the pest and disease control methods for Prunus x cistena (purple-leaf sand cherry)?

1. Disease control methods.

A strict inspection system must be implemented, and inspections must be carried out before the transport of seedlings. Once crown gall disease is found, the trees must be destroyed immediately, and the site where the diseased trees were planted must be thoroughly disinfected with quicklime or bleaching powder and other agents. Within one week after disinfection, no new seedlings should be planted in that soil.

For seedlings with initial disease infection, the diseased parts can be cut away with a knife, and then the wounds can be coated with lime milk or other agents to control the disease.

If it is a fully grown trunk, once it is affected by crown gall disease, penicillin, streptomycin and oxytetracycline can be used for subcutaneous injection or root soaking, which has a significant therapeutic effect on crown gall disease.

For seedlings that cannot be confirmed as infected with crown gall bacteria, they can be soaked in a 1% copper sulfate solution before planting, and after five minutes rinsed with clean water before planting.

2. Insect pests.

For insect pests, during the annual winter whitewashing, the trunk and large branches of the purple-leaf cherry can all be whitewashed, and at the same time the eggs and cocoons of the insects should be removed completely. As the trees grow in early spring, fungicides such as chlorothalonil and carbendazim should be sprayed in time for protection. Slug moths, aphids, leafhoppers and scale insects can be killed by spraying deltamethrin and similar agents, while red spider mites can be controlled with dicofol.

Control of the main pests and diseases of Prunus x cistena

During cultivation, Prunus x cistena is affected byslug moths, aphids, red spider mites, leafhoppers, scale insectsdamage. When whitewashing in winter each year, the main trunk and large branches should be whitewashed as much as possible, and the insect eggs and cocoons should also be scraped off cleanly. In early spring, broad-spectrum fungicides such as chlorothalonil and carbendazim should be sprayed in time.

If diseases occur, they must be treated promptly. Slug moths, aphids, leafhoppers and scale insects can be killed by spraying deltamethrin and similar agents,red spider mitescan be controlled with dicofol.

Opinions on pest and disease control and safe pesticide use for flowers and nursery stock in summer

    At present, we have entered the season of midsummer, which is the peak season for flower and nursery stock pests and diseases in our district and a critical period for control. All localities should strengthen surveys and effectively carry out control.
I. Occurrence of the main pests of flowers and nursery stock
1. The third generation of the tobacco cutworm and the beet armyworm. These two pests have a wide range of host plants and cause extensive damage, with a tendency toward outbreak feeding. Damage is most severe especially under drought conditions. According to observations with sex pheromone traps at the Xinjie site, the initial peak began on July 14, with the peak on July 16 (moth counts in three sex pheromone traps: tobacco cutworm 52, beet armyworm 12). From July 16 to 19, moths emerged abundantly for four consecutive days, with cumulative moth counts of 174 tobacco cutworms and 35 beet armyworms. A survey on July 21 found that the tobacco cutworm had already laid egg masses and caused damage by young larvae on crops such as purple-leaf plum, dichondra and clover. At the highest point, one square meter of clover had 28 young larvae and one egg mass. A survey of beet armyworm on Chinese arborvitae and Chinese juniper seedlings found larval damage, with the highest point having 3 young larvae per square meter. It is predicted that these two pests will break out severely in late July and early August. They mainly damage many herbaceous flowers and nursery stock such as purple-leaf plum, dichondra, clover, Prunus x cistena, boxwood, Chinese arborvitae and Chinese juniper seedlings.
2. The second generation of slug moths. According to observations with a forecasting lamp, the moth numbers of the yellow slug moth and the flattened slug moth began to rise on July 11, and the first moth peak appeared on July 18. It is predicted that the peak emergence period will continue into early August, with young larval damage occurring at the same time. The main damaged crops include many nursery stock such as poplar, willow, elm, pear, crabapple and magnolia.
3. Mites: Due to being washed by rain in the earlier period, red spider mites rose relatively slowly. A survey on July 21 found occurrences on crops such as boxwood, osmanthus, firethorn, Chinese juniper and Chinese rose, with a mite-infested plant rate of 8-13%. Recently, as we enter the hot midsummer, if drought occurs and reproduction accelerates, they will inevitably spread rapidly.
4. Lace bugs. Mainly including the tea bug, pear lace bug and shining lace bug, they damage crops such as lilac, crabapple, elm, mulberry, cherry blossom, peach, pear, rhododendron and firethorn. Lace bug damage is most severe from July to August.
5. Leaf roller moths (small leaf roller moth, rear yellow leaf roller moth). Moths under the forecasting lamp have already increased, entering the peak period on July 11, with a peak on July 20. Late July is the peak period of larval damage. They mainly damage many crops such as water wax, boxwood, plum, plum, pomegranate, etc. The larvae damage tender leaves, flower buds and young fruit. The larvae generally feed on the fruit surface by binding leaves together in rolled leaves or where two leaves overlap.
II. Safe use of pesticides.
For the control of flower and nursery stock pests, biological pesticides and highly effective, low-toxicity, low-residue pesticides should be promoted and applied.
1. For the control of moth pests, at the peak hatching period of moth eggs to the peak occurrence period of young larvae, the following agents can be selected: 1. Bt at 120 times dilution containing 12 billion bacterial spores per liter. 2. 20% miman suspension concentrate at 1000 times. 3. 24% meiman suspension concentrate at 3000 times. 4. 40% chlorpyrifos at 800 times. 5. Aolv No. 1 at 800 times. 6. 5% yitaibao emulsifiable concentrate at 1000 times.
2. Agents for controlling mites: 1.8% abamectin emulsifiable concentrate at 2500 times or 15% pyridaben at 2500 times can be selected.
3. Agents for controlling lace bugs: 10% imidacloprid at 2000 times or 40% acephate at 1000 times can be selected.
III. Precautions: Depending on the development of the pest situation, treat 2-3 times consecutively at intervals of 5-7 days. When applying pesticide, spray a sufficient amount of liquid to ensure the control effect, and at the same time pay attention to rotating the agents to improve efficacy and delay resistance. As it is currently the high-temperature season, pesticide should be applied in the evening, and the pesticide concentration should not be increased blindly.