Trees often appear leaf mottled, so that the leaves appear pale white spots, it looks like the tree is very weak, so what is the harm? It is understood that it is caused by the harm of the sucking pest leafhopper, in order to do a good job in prevention, you must first understand the occurrence of the leafhopper.
[1] The harm of leafhoppers
Leafhoppers, also known as leaf jumpers and floating dust, are thorn suckers that suck nutrients from leaves and young branches. Roseaceae, mallowaceae, Asteraceae and many flowers are often killed, and the summer occurs most in July and August, causing the flowers to malnourished and leaving leaves early, so that the flower buds cannot be differentiated. Leafhoppers suck up plant sap with adults and nymphs. After the leaf is killed, pale dots appear, and the latter dots are connected into pieces until the whole leaf is pale and dead. Others cause scorched spots and plaques that cause the leaves to fall off prematurely. Leafhoppers reproduce 4 to 5 generations a year, and adults have phototropism.
[2] Occurrence law
Adults overwinter in evergreen trees such as cypress or in weeds. Nymphs or adults suck up sap with spines to make the leaves appear pale white spots, and when the damage is severe, the spots appear patchy, or stab the epidermis, causing the branches and leaves to wilt.
Insects in this family feed on plants and usually overwinter as adults or eggs. In warmer regions, various insect stages can be seen in winter, and there is no real hibernation process. Overwintering eggs are also laid in the host tissue. Adults lurk among the branches and leaves of the plant, in the crevices of the bark, and move when the temperature rises. Both adult and nymphs suck up plant sap. After the leaf is killed, a pale dot appears, and the latter dots are connected into pieces until the whole leaf is pale and dead. Others cause scorched spots and plaques that cause the leaves to fall off prematurely. Adults and nymphs are good at walking and jumping, and adults can fly away. Nymphs tend to stay still in situ for feeding, and adults are active and mostly have phototropism.
[3] Prevention and control methods
1. Physical prevention and control Use the rotational light of leafhoppers to set up black light booby traps or use ordinary lights to booby trap.
2. Chemical control In the nymph bloom period and when the damage is serious, pharmaceutical control can be carried out. You can use tree insects once net or forest worm net to control; or use root application product tree worm clean medicine, can be up to half a year without insects, and easy to operate!
How to use root tree insect clearing:
(1), first dig a 10-15 cm deep circular ditch around the tree, dilute the agent according to the chest diameter of the tree (cm): dosage (g): water consumption (kg) = 1:1:2 dilution, stir and dissolve and evenly spread in the circular ditch, and cover the soil after the water is dried.
(2), for hedges and green belts, the agent can be directly diluted with water 1500-2000 times for spraying, which can also achieve long-term insecticidal effect, and at the same time can also kill most of the underground pests, one medicine and two effects;
(3) Potted plants, bonsai and other plants can also be directly diluted with water 1500-2000 times liquid watering.
Notes:
(1) The flow of sap in the tree is faster at higher temperatures, which is conducive to the exertion of medicinal effects; it is ineffective for mites;
(2), the application of drugs should be before the occurrence of pests or the initial stage, because the duration of the effect is relatively long, so there is no need to worry about the efficacy of the drug will be reduced, generally 1-2 weeks before the occurrence of pests can be used.
3. Wrap the sticky worm tape
Wrapping sticky worm tape around young tree branches can both prevent dehydration and prevent leafhoppers from laying eggs and reduce the number of insect mouths in the coming year.
