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Key Points of Boxwood Looper Control Techniques Explained

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I. Damage symptoms: Euonymus bungeanus, boxwood, Euonymus alatus, elm, poplar, willow, etc. The larvae gather on leaves to feed; after eating the leaves bare, they gnaw the bark of tender branches, causing the whole plant to die. II. Occurrence pattern: 2-3 generations per year, overwintering as pupae. Adults rest in hidden spots among branches and leaves during the day, and emerge at night to move about, mate and lay eggs; eggs are laid on the underside of leaves, arranged in double rows or in masses. Egg masses contain dozens to over a hundred eggs. Hatching mostly occurs in the morning from 5:00-8:00; the larvae gather on the underside of leaves to cause damage, chewing leaves and the bark of tender branches; mature larvae spin silk and drop to the soil to pupate.

I. Damage symptoms: Euonymus bungeanus, boxwood, Euonymus alatus, elm, poplar, willow, etc. The larvae gather on leaves to feed; after eating the leaves bare, they gnaw the bark of tender branches, causing the whole plant to die.

II. Occurrence pattern: 2-3 generations per year, overwintering as pupae. Adults rest in hidden spots among branches and leaves during the day, and emerge at night to move about, mate and lay eggs; eggs are laid on the underside of leaves, arranged in double rows or in masses. Egg masses contain dozens to over a hundred eggs. Hatching mostly occurs in the morning from 5:00-8:00; the larvae gather on the underside of leaves to cause damage, chewing leaves and the bark of tender branches; mature larvae spin silk and drop to the soil to pupate. Adults are not strong fliers and have a strong phototaxis.

III. Control methods

1. During the adult emergence period, use light traps to kill them.

2. Taking advantage of the adults' weak flying ability and their habit of gathering on the upper and lower parts of host plants in the morning and evening, capture and kill them with simple tools.

3. During the peak egg-laying period of adults, remove egg masses and newly hatched larvae from weeds around the root zone; plowing the soil around the roots in winter can kill overwintering pupae.

4. During the larval damage period, spraying 50% phosmet emulsifiable concentrate at 200 times dilution, 50% fenitrothion emulsifiable concentrate at 500 times dilution, or 25% carbaryl wettable powder at 300-500 times dilution gives good control results.

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