May is the first high growth and rapid growth period of flowers and trees, flower farmers in the nursery fertilization, weeding, tillering work at the same time, to do a good job in time to do a good job of pest control, according to our previous years and the current survey, now the main insect pests and control measures of flowers and trees are introduced as follows:
1. Shandong broad-winged wax cicada
The second generation occurs in one year, and the first generation begins to hatch in mid-to-late April, which is more neat; the second generation is not neat and begins to hatch in July-August. Nymphs (white) and adults (black like flies) cluster on young leaves, buds and shoots to suck sap, nymphs crawl quickly and jump, and adults fly strongly and quickly. Adult black worms lay eggs in the branches of the year, affecting the growth of the branches, and the heavy ones die above the spawning part, weakening the tree. Since its discovery in our city the year before, nurseries in some townships have been seriously endangered. According to the survey, the first generation in our city has been hatching since mid-April and is still in the nymph stage, but it has a strong jump. Due to the strong flying power of nymphs and adults, they spread quickly. Its hosts are extensive, and almost all flower and tree seedlings occur. If flower farmers have any occurrences in the investigation, they should promptly carry out prevention and control. Control method: Can be used chlorpyrifos emulsion + 10% imidacloprid emulsion 1000---- 1500 times spray, the effect is better.
2. Aphids
According to our survey and flower farmers, this year's magnolia, red leaf plum, begonia, large-leaf boxwood, peach, weeping willow, moon season, large-leaf boxwood, cherry, pomegranate and other seedlings in our city are common, and the population density of individual young shoots is as high as more than 100, and the branches and leaves after being harmed by aphids are curled and deformed, and the growth is poor, and its excreta often induces coal pollution, affecting the ornamental value. Due to the strong reproduction rate of aphids, most aphids occur in more than 10 generations a year, and some even exceed 30 generations, so as the temperature rises, aphids will multiply in large numbers, and the harm will be aggravated. All flower and tree production units, greening maintenance units and residential communities are invited to carry out insect investigations and seize the time to carry out prevention and control. Control method: can be sprayed with imidacloprid or cyanoparamon 1000 times liquid; because aphids mostly occur on the leaf back, young branches and flower buds, spraying should pay attention to the upper part of the branches and the back of the leaves, and the mist droplets should be fine and sprayed evenly.
3. Ticks
According to the information of the flower and wood disease and insect detection point and our investigation of the flower and wood garden, it was found that all kinds of insect shell insects have hatched one after another, and the common ones are: long white borer, mulberry white ant, red wax bug, Japanese turtle wax borer, etc., all kinds of insects are endangered by adult or nymph swarms in leaves, shoots, branches, etc., so that the affected flowers and trees delay germination and long leaves, the branches are dry, some of the whole plant dies, and at the same time can induce gray mold. The main harm tree species are red maple, locust tree, camellia, tea plum, wolfbone, boxwood, laughing, fire thorn, gardenia and so on. Judging from the survey situation, it occurs to varying degrees everywhere, especially in the wet and low-temperature, poorly ventilated plots, the occurrence is more serious, from our sampling survey of the victim garden, the rate of insect plants is more than 50%, and the plants with large insect population density have more than 10 worms per square centimeter of branches, or even up to 100 heads, and dense insects surround the entire trunk, seriously affecting its growth.
At present, the first generation of long white borer and mulberry white borer have begun to lay eggs, and it is expected to reach the peak of incubation in early and mid-May, and the second and third generations will reach the peak of incubation in mid-to-late July and mid-to-late September respectively; red wax bugs and Japanese turtle wax bugs occur once a year and will start laying eggs in mid-May, and the incubation period is peak in early to mid-June. When the hatching nymph crawls out of the mother and wanders, the control effect is the best, so attention should be paid to the selection of control during the incubation period of the nymph, and the control methods that can be used are as follows:
1, early to mid-May and early to mid-June nymph incubation, thiazide + 10% imidacloprid emulsion, 40% Lesben emulsion, 20% rapid culling emulsion, 10% cypermethrin emulsion oil choose any one, with 1000 ~ 1500 times liquid spray, it is best to repeat the spray twice depending on the reduction of the worm mouth, can basically kill the insectworm.
2. Combine the pruning of the whole branch, cut off the branches with insects, and remove them from the nursery for centralized destruction.
3. Strengthen the management of the garden, pay attention to ventilation and light transmission, reduce water accumulation, and inhibit the occurrence of insect pests.
Fourth, the agent is applied to prevent dry moths
In recent years, dry borer pests such as tianniu, beetle moth, transfiguration moth, gidding worm and other dry insects have caused serious harm, and often a slight negligence will cause irreparable losses to ornamental flowers and trees such as weeping willows, luan trees, sanstructers, and red maples. If the branch prevention is applied with a mixture of oxidized fruit and sustained-release white latex, the effect is better, and the specific method is as follows:
1, liquid: with 40% oxidized Fruit 1 part, sustained release agent 0.1 parts, water 6 parts, pour in a suitable container, stir well with a wooden stick, you can apply.
2, smearing: the occurrence time of dried moth pests is from June to August, so the first application should be carried out about a week before the occurrence of pests, that is, in late May, the second time at the end of June, and the second application can be done twice.
3, method: with the appropriate small brush, the need to prevent the flowers and tree branches for careful application, a finger of thickness of the branches should be used to brush the liquid evenly coated, do not miss.
The advantage of this method is that the adult moth pest is large, flying around, and the breeding period is staggered, it is difficult to eradicate with spray control, if there is one or two adult worms that slip through the net, egg laying and hatching can cause harm. Apply with a mixture of oxidized Leguo and extended-release white latex, because white latex has a good sustained release effect, which greatly prolongs the effective prevention and control period of Oxidized Leguo. When adults fly to the medicated branches to lay eggs, they will be driven away by the oxidized fruit, even if one or two adult worms lay eggs on the medicated branches, the active ingredients of the oxidized fruit will kill the eggs, making it impossible to hatch, fundamentally preventing the moth insect infestation.
5. Red Spider
Red spiders mainly harm the leaves, stems, flowers, etc. of flowers and trees, and sting the stems and leaves of plants, so that the water of the affected parts is reduced, the performance is green and white, and the leaf surface shows dense pale small spots, curly and yellow. In severe cases, yellow leaves, scorched leaves, curly leaves, defoliation and death occur in the plant. Peak in mid-May, with the peak of the year from July to August, with late June to early July being the most serious. It often causes the leaves of the whole seedling to wither and yellow and white.
Prevention and control methods:
1. In early spring or winter, spray 3 to 5 baume degrees of stone sulfur compound on the plant, and press 0. 2% to 0.3% add laundry detergent to enhance the spread of the agent. It can kill overwintering eggs or adult mites and reduce the population base.
2, the large occurrence period, can spray Avida mite emulsion 1000 to 1500 times, 20% exoler emulsion 2000 times, 5% Nisoran emulsion 1500 times, 40% oxidized Leguo emulsion 1500 times, 10% Uranus emulsion 300 0 times, etc., choose any of the above agents, and use alternately.