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An aphid infestation can ruin a garden. Learn what causes aphids and how to identify, kill, and control them naturally for healthy plants with no aphid holes. Read This If Aphids Are Eating Your ...
This may halt the infestation if you detect it early enough, says Khan. Blast insects off with the hose. “A high pressure spray can physically remove them from garden plants,” says Kahn.
However, while garden aphids often spell disaster for vegetables and flowers, milkweed aphids usually don’t do much damage, and pest control treatments can do more harm than good.
The aphids do not usually cause much damage to overall tree health, but dieback is occasionally seen on very heavily infested branches. If infestations are heavy, twigs may die, but damage to the tree is usually minor. The aphids can be blasted off with a jet of water or can be controlled with any insecticides labeled for aphids.
Woolly aphids occur throughout the Northern Hemisphere. Many of the numerous species of woolly aphids have only one host plant species, or alternating generations on two specific hosts. They have been known to cause botanical damage and are often considered a pest. While most damage is minor, they can spread plant diseases and fungi.
Entomopathogenic fungi, which cause disease in insects, include at least 14 species that attack aphids. [77] Beauveria bassiana is mass-produced and used to manage a wide variety of insect pests including whiteflies, thrips, aphids and weevils. [78] Lecanicillium spp. are deployed against white flies, thrips and aphids.
Aphids can also transmit viruses and allow sooty mold to take hold. When the population becomes too large, an aphid might grow wings and fly away to find a fresh host plant.
Prolonged aphid infestation can cause an appreciable reduction in the yield of root crops and foliage crops. [ 21 ] The green peach aphid transmits several destructive viruses in pepper including pepper potyviruses and cucumber mosaic viruses , which causes plants to turn yellow and the leaves to curl downward and inward from the edges.
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