Melon Aphid, Aphis gossypii
(Hemiptera: Aphididae)

The melon aphid is distributed throughout the southern portion of the United States. It overwinters in greenhouses in northern states and may be introduced into field with transplants in the spring. Mating is not required in order for offspring to be produced in the South. The life cycle can be completed in a week, so numerous generations are possible under suitable environmental conditions. The nymphs vary from tan to gray to green and often have a dark head. The body is dull in color. The adults are variable in color from whitish to green. The legs are pale with the tips being black. Melon aphid has a wide host range consisting of at least 60 host plants.

The melon aphid is a serious pest on watermelons, cucumber, squash, pumpkin, and cantaloupe. Other vegetable crops that are seriously affected are asparagus, pepper, eggplant, and okra. Melon aphids feed on the underside of leaves or on growing tips of vines sucking nutrients from the plant. Infested foliage may become yellowish in color and die. Leaf curling is also a symptom that is caused by melon aphids. Since the melon aphid produces honeydew, sooty mold maybe present that will affect the quality of fruit and the photosynthetic capacity of the plant. The melon aphid may also transmit viruses. Stylet oils may be applied in order to deter transmission of plant viruses. Many natural occurring enemies are known to be effective against melon aphids and may provide sufficient melon aphid control. Insecticides are commonly used but resistance has been noted to many chemicals, and excessive and unnecessary use should be avoided. Cultural control practices that can be used include destruction of infested crops, use of row covers, and early planting dates.

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Melon aphid, Aphis gossypii, dark form of wingless adult
and nymphs of mixed ages.
(Photographer: J. Castner, University of Florida)

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Melon aphid, Aphis gossypii, winged adult (yellow morph).
(Photographer: P. Choate, University of Florida)

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Melon aphid, Aphis gossypii, wingless adult (yellow morph).
(Photographer: J. Castner, University of Florida)

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Melon aphid, Aphis gossypii, tended by ants.
(Photographer: L. Buss, University of Florida)

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Melon aphids, Aphis gossypii, winged adult (black morph).
(Photographer: P. Choate, University of Florida)

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