What pests should be controlled when growing osmanthus trees?
What pests need to be prevented when growing osmanthus trees? Please give an introduction. Osmanthus tree pests include jewel beetles, scale insects, stinging caterpillars and bagworms. Zhongdiwang has compiled control methods for osmanthus tree pests, listed below for everyone's reference. I. Damage and control methods of jewel beetles. Damage by jewel beetles: larvae bore and feed within the bark of branches...
What pests need to be prevented when growing osmanthus trees? Please give an introductionOsmanthus tree pests include jewel beetles, scale insects, stinging caterpillars and bagworms. Zhongdiwang has compiled control methods for osmanthus tree pests, listed below for everyone's reference.
I. Damage and control methods of jewel beetles
Damage by jewel beetles: larvae bore and feed within the bark of branches and trunks, exuding oil-droplet-like brown gum. When the damage is severe, the bark splits open and the main branches or the whole plant die. Adults bite and feed on young leaves, causing notches, and in severe cases cause heavy leaf drop. Trees that are poorly managed and weak in vigor suffer more severe damage.
Control of jewel beetles: during the peak larval hatching period (generally May), scrape off the bark and apply 80% dichlorvos emulsifiable concentrate at 20 times dilution; during the adult emergence period (about June), spray the canopy with 90% trichlorfon at 1000 times dilution 2 to 3 times.
II. Damage and control methods of scale insects
Damage by scale insects: the scale insects that harm osmanthus include red wax scale, cottony cushion scale and Chaff scale. Nymphs and adults insert their mouthparts into branch and trunk tissues to suck sap, causing branches and leaves to wither and die. At the same time, they secrete honeydew, inducing sooty mold, and the damage is severe.
Control of scale insects: during the nymph hatching period, spray 20% fenpropathrin-plus-malathion emulsifiable concentrate or 2.5% deltamethrin emulsifiable concentrate at 2500 times dilution; when the scale covering has formed, spray 40% methidathion emulsifiable concentrate at 1500 times dilution, which has strong penetration and gives good control results.
III. Damage and control methods of stinging caterpillars
Damage by stinging caterpillars: the main stinging caterpillars that harm osmanthus include the yellow stinging caterpillar, green stinging caterpillar, blue-green stinging caterpillar and flat stinging caterpillar. They mostly overwinter as larvae in cocoons. Young larvae gather to feed on leaves, with the heaviest damage from July to September. Adults are strongly phototactic.
Control of stinging caterpillars: from May to June, use black light traps to kill adults; manually remove cocoons attached to branches and trunks; during the young larval stage, carry out chemical control in time. You may choose 10% cypermethrin at 2000 times dilution or 90% trichlorfon at 1000 times dilution to spray and kill the larvae.
IV. Damage and control methods of bagworms
Damage by bagworms: the main bagworm species that harm osmanthus include the large bagworm and the tea bagworm. Larvae can spin silk to make cocoons, with various broken twigs and dead leaves stuck on them, forming bags of various forms. The larvae mostly gather at the top of the canopy to feed on leaves. In severe cases, they can eat all the leaves, causing severe damage to plant growth or even death.
Control of bagworms: in winter, prune out infested branches and remove the bags; during the young larval stage, carry out chemical control in time. You may choose 95% crystalline trichlorfon at 1000 times dilution or 50% fenitrothion at 1000 times dilution to spray and kill the larvae.
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