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Psyllids |
| General recommendations. These insect pests, similar to aphids, can damage the tender growth of trees by sucking out the plant's juices. They also secrete honeydew that coats leaves and may encourage the growth of a sooty black mold. Symptoms of damage include yellowing and dropping leaves.
To control these pests, spray with insecticidal soap every 3-4 days until the insects are gone. In fall, spray trees with a light horticultural oil and, in early spring, spray trees with a dormant oil before the leaves emerge. After the leaves emerge, spray insecticidal soap once a week for 3 weeks. |
Images: Click on image to enlarge or on underlined captions for more information.
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Feeding by psyllids (Hemiptera) produces these mammiform galls on the underside of hackberry leaves (Celtis) called hackberry nipple galls
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High resolution image available.
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Feeding by psyllids (Hemiptera) produces these mammiform galls on the underside of hackberry leaves (Celtis) called hackberry nipple galls
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High resolution image available.
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The upper leaf surface of hackberry leaves (Celtis) showing bleached, circular depressions where feeding by psyllids (Hemiptera) has produced hackberry nipple galls underneath
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High resolution image available.
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Feeding by psyllids (Hemiptera) can cause cupped, distorted, stunted leaves on boxwood (Buxus); note, normal size and shape of new growth
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High resolution image available.
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