Nowadays, it is the season of spring and the revival of all things, the plants are eager to take root and sprout, and the pests are eager to try, scrambling to climb on the plants and prepare a beautiful meal. However, as the guardians of plants, gardeners do not necessarily agree. Next, let's analyze which pests occur when spring is not:
Grasshopper is an insect of the genus Grasshopper in the family Homoptera, and is named Grasshopper because the adults resemble grass shoes. It is considered to be the earliest pest in the garden, which begins to hatch in the soil, can resist low temperatures, and can hatch under the snow piles before and after the "big cold", and the incubation period lasts for more than 1 month. Its distribution in Hebei, Shanxi, Shandong, Shaanxi, Henan, Qinghai, Inner Mongolia, Zhejiang, Jiangsu, Shanghai, Fujian, Hubei, Guizhou, Yunnan, Chongqing, Sichuan, Tibet and other places, endangering begonias, cherry blossoms, figs, ziwei, moon season, red maple, citrus and other flowers and trees. Nymphs and female adults often gather in piles on bud axils, shoots, leaves and branches, sucking sap hazards, causing poor plant growth and early defoliation.
Grasshoppers occur once a year. Eggs are used to overwinter and overwinter in the soil; nymphs are found and climb along the stem to the tip, axillary or leaf axillary of the buds or the leaf axillary of the new leaves. When the density of nymphs and adult insects is high, they often migrate in groups, crawl all over the nearby walls and ground, and even burrow into residents' homes, affecting hygiene and disgusting.
Grasshoppers harm purple leaf plums
Aphids are also known as greasy insects, oil worms, honey worms. Aphids belong to the order Homoptera, pests of the aphid family. There are many types of aphids, usually green, yellow, black, brown color, mainly harmful to hibiscus, bauhinia, peach, purple leaf plum, plum blossom, large-leaved boxwood, Fuso, pomegranate, chrysanthemum, oleander, moon season, elm leaf plum, sticking stem begonia, national locust, luan tree, red leaf heather and other plants.
Aphids tend to cluster on buds, young leaves or young branches of the plant, sucking the sap of the plant with their sucking mouthparts. When it infringes on the leaves of the plant, the leaves of the victim plant are rolled back and dried up, affecting the photosynthesis of the leaves, which is extremely unfavorable to growth, and when it is serious, it causes all the new shoot leaves to twist and roll into clumps, and even dry off. Plants infested with aphids will have yellowing and deformation of branches, flower buds will be corrupted, the flowering period will be shortened, the flowers will fade, and in severe cases, the whole plant will even wilt and die.
Aphids harm hibiscus
Hangzhou cardiothoracic aphid is an insect of the genus Neothracilidae of the family Homoptera, distributed in East China, Central China, Southwest China and other regions, the Yangtze River Basin is a great hazard, mainly harmful to mosquito mothers. This insect sucks and endangers the new leaves, after being killed, it rises around the insect body, and gradually buries the insect body to form a gall, the gall continues to grow, can reach the size of a soybean, the largest is close to the size of a broad bean, from April to May, the gall becomes red, ruptures, and the winged flying aphid migrates to the second host hazard.
Hangzhou heart-breasted aphid endangers mosquito mothers
Large-leaved 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. Harm big-leaf boxwood, big flower guard spear, fufang vine, silk cotton wood and so on. The leaves are fed by the larvae and, in severe cases, the leaves are eaten out. 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.
The large-leaved boxwood spotted moth lives in groups
Boxwood silkworm This insect occurs in 2 to 3 generations a year, and begins to shell out in late March, mainly harming the plants of the boxwood family. The hatching larvae feed on the leaf flesh on the back of the young leaves; the 2nd to 3rd instar spit silk connects the leaves and young branches into a nest, and the leaves are missing in the leaves; after the 3rd instar, the amount of food increases, the feeding range expands, and only the filaments, molting, and insect droppings remain in the seriously damaged plants, and a small amount of leaf edges and leaf margins are left; the larvae eat the harm day and night, and transfer the harm after 4 years; the sexual alertness, when it encounters an alarm, immediately hides in the nest, and after aging, the spit silk conjugates the leaves as cocooned pupae.
Boxwood silk borer hazards
The above pests are the vanguard of plant pests, which can be said to occur earliest in the spring, the widest range of harm, and the greatest damage to the garden landscape. Caregivers can control their hazards through physical, biological, chemical or cultivation measures, and give plants a fresh spring.
(The author of this article is Chen Zhaoliang, the unit is the Institute of Plant Protection Technology of Ping'an Garden in Zhengzhou City, Henan Province)