Nowadays, it is the season of spring and warm blossoms and the recovery of all things, plants are eager to take root, pests are also eager to try, and garden maintenance has entered a busy season. Let's take a look at what are the garden pests that need to be controlled in March?
1. Shell insects
Grasshoppers and blowing insects occur in large numbers in March, and other shell insects have also begun to harm. Among them, grasshoppers are considered to be the earliest pests in the garden, and they can also hatch under the snow piles before and after the "great cold". At this time, the insect shell insect is in the nymph stage, which is also the best time for control.
Hazards: The insects feed on plant sap with a stinging mouthpiece, which mainly harms the leaves, branches or fruits of flowers and trees, causing yellowing, deformity, poor growth, and early leaf fall. At the same time, its secretions and excrement can easily lead to the occurrence of diseases such as coal pollution disease of flowers and trees, and can lead to the death of flowers and trees when serious.
Prevention and control methods
■ Prevention method: Before the budding in the spring, ping'an stone sulfur compound and ping'an lintai can be used to do garden clearing work.
■ Barrier method: Use sticky insect tape to wrap the trunk of the tree one meter from the ground to prevent the insect shell from harming the tree.
■ Chemical control method: the use of Ping'an search for a set of 80-100 kg spray control of water.
2. Aphids
Aphids have the largest incidence, the widest area of occurrence, and the largest number of generations, also known as greasy insects, oil worms, and honey worms. It is a pest of the family Aphididae. There are many types of aphids, usually green, yellow, black, and brown. It mainly harms hibiscus, bauhinia, peach, purple leaf plum, plum blossom, large-leaf boxwood, fuso, pomegranate, chrysanthemum, oleander, moon season, elm leaf plum, sticker begonia, national locust, luan tree, red leaf heather and other garden plants.
Hazards: Aphids are the key control objects this month, with the rise of temperature will lead to a large number of aphids, harmful to a variety of plants, often clustered in plant leaves, young stems, buds, top buds and other parts of the sap, so that plant growth is hindered, resulting in leaf shrinkage, curling, deformity, serious impact on plant growth and ornamental effect, serious when the whole plant will even wilt and die. At the same time, it can also spread coal pollution disease and viral disease.
■ Protect and utilize natural enemies, such as carnivorous ladybirds, grasshoppers, aphid-eating flies, etc.
■ Yellow sticky aphid plate can be used for physical removal.
■ Chemical control: When the insect population density is large in spring, it can be sprayed with 3000 times the dilution liquid of tyrannous aphid zhen (80% enopyridone), 600 times dilution of rui thorn (5% acetamidine), and 4000 times dilution of reika (22% thiaceum and perchlorofluoride).
■ If you want to use a drug for one year without aphids, it is recommended to use Jinrui irrigation (22.4% helioethyl ester) diluted 1500-2000 times liquid irrigation, and the effective period is 6--12 months.
3. Red Spider
Red spiders are not spiders, but non-insect mites, also known as cotton red spiders, commonly known as large spiders, large dragons, sand dragons. Red spiders are pests of the arachnids, tick mites, and leaf mites, with small individuals, less than 1 mm in length, usually round or ovoid, and orange or reddish brown in color.
Red spider is widely distributed, commonly occurring everywhere, its eating miscellaneous, pest plants reached more than 100 kinds, is a relatively common destroyer, affected by the garden plants are moon season, Milan, jasmine, kumquat, begonia, osmanthus flower, bergamot, peach, peach, peach, purple leaf plum, jasmine, hibiscus, bauhinia and so on.
Hazards: Adults, juveniles, and nymphs of red spiders suck up the host juice on the back of their leaves and form silk webs. The chlorophyll of the initial damaged leaves is destroyed, and sporadic faded green spots appear on the leaf surface. When the damage is serious, the host leaf surface shows dense and fine yellow, grayish yellow, red spots or patches, and the leaf surface will gradually become gray-yellow until the whole leaf dries up and falls off, which seriously affects the growth and ornamental value of garden plants.
Red spiders are particularly capable of reproduction, generally up to more than 10 generations a year, and can reproduce both sexually and parthenogeneins. Especially under the conditions of high temperature and drought, the reproduction is rapid, the density of insect population is large, and the harm is serious. Above 30 ° C, a generation can be completed in about 5 days, and the generations overlap. Red spiders overwinter with eggs, overwintering eggs generally begin to hatch around the beginning of March, basically all hatched in early April, after wintering 1 to 3 generations mainly on the ground weeds to breed as a pest, after 4 generations that is, at the same time on trees and weeds as a pest, in mid-to-late October began to enter the wintering period. The eggs of red spiders overwinter mainly in places such as branches, dry bark crevices, ground crevices and weed bases.
■ In winter and spring, it is necessary to comprehensively remove weeds, dead branches, and fallen leaves, and use Ping'an stone sulfur compound to do a good job in clearing the garden.
■ Strengthen the detection and reporting of insect conditions, early detection and early control, you can use Ping'an Garden Rui Mite (6.8% Avi Da Mite) diluted 600 times liquid or full exhibition (35% Avi spirant mite) dilution 3000 times liquid uniform spray, focusing on spraying the back of the leaf.
4. Large-leaved boxwood spotted moth
The large-leaf boxwood spotted moth belongs to the lepidoptera spotted moth family, also known as the large-leaf boxwood long-haired moth or holly spear moth. Mainly distributed in Shanghai, Nanjing, Suzhou, Hangzhou, in recent years, the harm in the north has also increased year by year. It mainly harms large-leaved boxwood, large-flowered guard spear, fufang vine, silk cottonwood and so on.
Hazards: Feed on the leaves with larvae and eat the leaves in severe cases. The worm occurs once a year, overwintering on the branches with eggs, and in March of the following year the overwintering eggs begin to hatch and make harm. The hatching larvae cluster harm on the buds and eat the buds into a network; the 2nd instar larvae cluster ate the epidermis and leaf flesh on the back of the leaves, leaving the upper epidermis; after the 3rd instar, they began to disperse the hazards, eating the leaves into holes and gaps, and the heavy ones ate the leaves. In mid-to-late May, the larvae mature and droop into the 2-3 cm topsoil to form cocoons.
■ Use the characteristics of larvae with social habits to manually remove insect leaves.
■ Chemical control: medium and small larvae in the large-leaved boxwood spotted moth. Sprayed with Shrekka (22% 22% thiamethiasis perchlorofluoride) diluted 3000 times liquid, Pingtai (100g/L bifenthrin) diluted 2000 times liquid, Ruiguang (5% methyl vitamin salt • perchlorofluoride) diluted 1000 times liquid, Ruiwei (20% methiaxindine) 1500 times liquid, etc.
5. Boxwood silk borer
Boxwood silk borer, which occurs in 2 generations a year, begins to be out of the bag in late March, mainly harming the boxwood plants.
Hazards: The hatching larvae feed on the back of the young leaves to feed on the leaf flesh; the 2nd to 3rd instar spit silk connects the leaves and young branches into a nest, and the leaves are missing in the inner leaf; after the 3rd instar, the amount of food increases, the feeding range expands, and only the filaments, molts, and insect droppings remain in the seriously damaged plants, and a small amount of leaf edges and leaf margins remain; the larvae eat the hazard day and night, and transfer the hazard after 4 years; sexual alertness, immediately hide in the nest when encountering alarms, and spit silk conjugation leaves as cocooning pupae after maturity.
■ Chemical control: medium and small larvae in the large-leaved boxwood spotted moth. It can be sprayed with Shrika (22% 22% thiamethiasis perchlorofluoride) dilution 3000 times liquid, Ruiguang (5% methyl vitamin salt perchlorofluoride) dilution 1000 times liquid, Ruiwei (20% methyl vitae indiivir) 1500 times liquid, etc.
The article comes from the Internet, if there is infringement, please contact to delete.