What pests need to be controlled when planting osmanthus trees?
What pests need to be prevented when planting osmanthus trees? What methods are there to control these pests? We also ask experienced netizens to help introduce them. The common pests in osmanthus tree planting include jewel beetles, scale insects, stinging moths, and bagworms; Zhongdiwang has compiled the harm and control methods of the above pests, listed below for netizens' reference. Jewel...
What pests need to be prevented when planting osmanthus trees? What methods are there to control these pests? We also ask experienced netizens to help introduce themThe common pests in osmanthus tree planting include jewel beetles, scale insects, stinging moths, and bagworms; Zhongdiwang has compiled the harm and control methods of the above pests, listed below for netizens' reference.
Harm of jewel beetles to osmanthus trees:The larvae bore and feed within the bark of branches and trunks, exuding oily dotted brown gum. When the damage is severe, the bark splits open, and the main branches or the entire tree die. The adults bite and feed on young leaves, causing notches, and in severe cases, a large number of leaves fall. Trees with poor management and weakened vigor suffer more severe damage.
Control methods:During the peak hatching period of the larvae (generally May), scrape off the bark and apply 80% dichlorvos emulsifiable concentrate 20 times dilution; during the adult occurrence period (about June), spray the tree canopy with 90% trichlorfon 1000 times dilution 2 to 3 times.
Harm of scale insects to osmanthus trees and:The scale insects harmful to osmanthus include red wax scale, cottony cushion scale, and chaff scale. Nymphs and adults pierce their mouthparts into the tissue of branches and trunks 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 methods:During the nymph hatching period, spray 20% fenvalerate-phoxim emulsifiable concentrate or 2.5% deltamethrin emulsifiable concentrate 2500 times dilution for control; when the scale cover is formed, spray 40% profenofos emulsifiable concentrate 1500 times dilution. Because of its strong penetration, the control effect is good.
Harm of stinging moths to osmanthus trees:The main ones harmful to osmanthus trees include yellow stinging moth, green stinging moth, blue stinging moth, and flat stinging moth. Most overwinter as larvae in cocoons. Young larvae gather to feed on leaves, with the heaviest damage from July to September. Adults have strong phototaxis.
Control methods:From May to June, black light lamps can be used to trap and kill adults; manually remove the cocoons attached to branches and trunks; chemical control should be carried out promptly during the young larval stage. 10% cypermethrin 2000 times dilution or 90% trichlorfon 1000 times dilution can be used to spray and kill the larvae.
Harm of bagworms to osmanthus trees:The species harmful to osmanthus trees include large bagworm, tea bagworm, and others. The larvae can spin silk to make cocoons, with various broken twigs and dead leaves stuck on the outside, 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 methods:In winter, prune off infested branches and remove the bags; carry out chemical control promptly during the young larval stage. 95% crystalline trichlorfon 1000 times dilution or 50% fenitrothion 1000 times dilution can be used to spray and kill the larvae.
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