Leafhopper pests are small insects, and both adult and nymphs use stinging mouthparts to suck the sap inside the leaves and branches of kiwi fruit to maintain their growth, development, reproduction and life activities. As a result, the nutrients of the tree body are lost, so that the leaves and tender stems, branches and other damaged parts appear pale spots, and in severe cases, the entire leaves become yellow and white to pale, causing early leaf fall, affecting the tree potential, and seriously affecting the photosynthetic function of the leaves.
Leafhoppers, also known as floating dust, belong to the order Homoptera and pests of the family Leafhopper. Leafhoppers are one of the important pests that harm kiwifruit, there are more than 20 common species, of which the kiwifruit planting and management is more common, the harm is more serious are the following 6 species: small green leafhopper, large green leafhopper, scarlet small green leafhopper, peach leafhopper, electric leafhopper and black-tailed giant leafhopper, in Chengdu and Cangxi areas of Sichuan Province, the main harm to kiwifruit is the large green leafhopper.
Large green leafhopper
The large green leafhopper, also known as the great green floating dust, the green head worm, and the green leaf jumping cicada, belongs to the widely distributed omnivorous pest, which can harm corn, sorghum, rice, wheat, beans, vegetables, fruit trees and many other plant bodies. The affected plants all have small white spots on the leaves, the leaves are withered, and when the seedlings are seriously damaged, the leaves are yellow and curled, or even die.
This article is mainly aimed at the study of the harm of large green leafhoppers to kiwifruit, let's take a look at some detailed information about this pest and control methods.
<h1 class="pgc-h-arrow-right" >What are the characteristics of the large green leafhopper harming kiwifruit? </h1>
Leafhoppers suck the sap of kiwi leaves and branches with adults and nymphs, often causing the leaves to lose green and turn gray and white and fall off early, etc., and the growth and development are seriously affected.
Leafhopper outbreaks
Adults of the large green leaf cicada lay eggs in the leaves and branches of kiwifruit, and the spawning site is destroyed, and the tissues die, which has a great impact on the growth of the tree.
<h1 class="pgc-h-arrow-right" > Second, how is the life habits of the large green leafhopper composed? </h1>
In the Cangxi area of Sichuan, three generations a year occur, the eggs overwinter under the epidermis of the branches, and the overwintering eggs hatch in March of the following year, with the first generation of adults in April and the second generation of adults in June. The third generation of adults appears in September, and in mid-to-late September, it is the peak of spawning, and then enters a wintering state.
Hazards kiwi leaves
Adult and nymphs prefer to inhabit moist shades, and in the morning or when the temperature is low, the adult and nymphs are more dormant, and are more active at noon when the temperature is high.
Adult insects have strong flying activity and strong phototropism, especially in the summer when the temperature is higher, the performance is more significant, often a thousand heads can be lured under a lamp a night; if the insect is alarmed, it will run obliquely or horizontally to the shade to escape, or jump around.
Use pest phototropism to install insecticidal lamps to booby trap
Non-overwintering eggs are mostly produced in the dorsal tissue of the host leaf, the egg marks are crescent-shaped, each egg has 3 to 15 eggs, generally about 10 grains, more neatly arranged in an arc-shaped pocket; overwintering eggs are mostly produced in the cortex of young tree branches, which has the greatest impact on kiwifruit. The amount of eggs laid by a single female is 30 to 70 grains. The hatching nymphs like to gather on the main branches and leaves, and gradually disperse the damage later.
<h1 class= "pgc-h-arrow-right" > three, summarize the kiwi pest giant green leafhopper and other cicada three effective control methods</h1>
1. Clean orchard: Clean the orchard and purposefully reduce the population base of the overwintering insects. In winter and early spring, completely remove the stump and leaves in the park, bring out the park for centralized burning treatment, and eradicate weeds and weeds inside and outside the park and nearby, so as to reduce pests and infect the fruit trees in the park through other hosts.
Clean up debris from the park in winter
2. Light booby-trapping: In the adult blooming period of the large green leafhopper, use the light to trap the adult insects. Leafhopper pests have strong phototropism, and can use this feature to use insecticidal lamps to trap and kill adult cicadas, and the effect is more obvious.
3, pharmaceutical control: pharmaceutical prevention and control should be grasped in three key periods: First, the peak period of overwintering adult stinging activities. The second is the peak of the first generation of nymph hatching; the third is the peak of the hatching of the second generation of nymphs.
The insect state is more consistent in these three periods, and timely spraying can receive better control effects. Commonly used agents are: 50% dichlorvos emulsion 1000 times liquid in the early stage, and 800 to 1000 times the liquid of plant-derived pesticide 40% nicotinoid sulfate in the later stage, and 0.2% soapy water is added.
< h1 class="pgc-h-arrow-right" > concluding remarks</h1>
As one of the important pests that harm kiwifruit, cicada pests should be inspected in daily management and protection, especially when the garden is cleared in winter, the host items in the park that are conducive to the wintering of insect eggs must be cleaned out of the park for centralized treatment, or burned or buried deeply. There is also a need to pay attention to the fact that in the spring growth stage of kiwifruit, when the leaves are young, special attention should be paid to the prevention of this type of pest, and the young tissue is often the preferred target of insect pests and diseases.