Summer is in full swing and the melon patch seems to be growing nightly! Cantaloupes and watermelons have set fruit. With enough water these babies will grow quickly to maturity. However, water isn't the only limiting factor to your melons producing bountifully this year. While cucumber beetles and flea beetles may have been attacking your young melon seedlings, now that the vines have grown, other pests are a greater concern. Be on the lookout for these pests in your melon patch.
Spider mites are very tiny, spider-like pests that attack a variety of plants such as melons. Most gardeners don't notice them until they see the webs spider mites form. Heavy feeding by spider mites causes stippling — tiny holes — in the leaves. If severe, their feeding can cause leaves to die. When their population is small, they and their damage are hardly noticeable. However, during periods of hot, dry, dusty summer weather, spider mite populations can explode.
To control spider mites, spray leaves with forceful jet of water from a hose to dislodge them.You can also try spraying insecticidal soap, hot pepper wax, or horticultural oil on the leaves.
Aphids are small insects that feed on melon leaves. They tend to attack once the melon vines starting running. Aphids are small sucking insects that come in colors ranging from light yellow to black. Heavy feeding can cause leaf dieback and reduction in melon quantity and quality. They also can spread diseases such as cucumber mosaic virus.
Like spider mites, aphid populations explode during periods of hot, dry weather. Encourage natural predators such as lady bugs by planting flowers around the melon patch and having a water source such as a water garden nearby. To control severe infestations, spray the undersides of the leaves with insecticidal soap or hot pepper wax, and place yellow colored pans filled with water in the melon patch to catch adults. The adult aphids are attracted to the color yellow.
Although their feeding is most severe on squashes and pumpkins, squash bugs do attack melons and can cause considerable damage to leaves. These flat-backed, brown bugs emerge in spring. They lay clusters of red-brown eggs on the underside of leaves which hatch into small brown nymphs that look similar to the adults. The young and adults feed on the leaves.
Squash bugs like to hide; you usually won't see them until you turn over an infested leaf. They will scurry away under other leaves and plant debris. You can use this secretive nature to trap them. Placing a piece of cardboard under the plants, check under it every few days, and crush any squash bugs congregated there. Control the adults early in the season to reduce problems when the population explodes in late summer. Control heavy infestations of nymphs with applications of neem oil. Clean up the site well in fall to remove places where adults can overwinter.