When a plant becomes infested with these mites, its leaves will dwarf, curl and thicken. Another option is to introduce green lacewings to your garden. This will lead to defoliation and twig or branch dieback. Updated: July 31, 2016. The adult leafminer is a small black or gray fly with a yellow stripe and clear wings. Verbenas are annual or perennial plants with purple, pink, red or white flowers. & Broome) Ferraris Chalara elegans Nag Raj & Kendr. Verbena boasts an impressive list of 250 species that include perennial, shrubs and herbaceous annuals. They also form galls in the tissue that surrounds the insect’s larvae and provide a food source for the larvae. Green lacewings are a member of the ladybug family and feed on mealy bugs. Her previous jobs include reporter, photographer and editor for a weekly newspaper. Regularly remove weeds that can host the caterpillars from around the verbena. Sticky traps will help control adult thrips while Neem oil applied to the verbena will control the insect’s larvae. Plan the perfect garden with our interactive tool →. Other thrips feed on plants causing scarring and distorted plant parts as well as stunted plant growth. Shaking the plant lightly will result in a cloud of whiteflies flying off the plant. Before using insecticides, horticultural oils or insecticidal soap on the verbena, always read and follow the usage instructions. Verbenas have a key position among bedding, hanging basket and container crops. To help prevent fungal disease, adequate air circulation is necessary. However, larger infestations will lead to twisted leaves, stunted growth and cover the plant with a sticky substance -- called honeydew -- that encourages powdery mildew growth. But if there is an excessive watering or summer is wet and hot, the plant can be affected by powdery mildew that is treated with sulfur or fungicides. The spots merge into large areas of necrotic tissue. Flanigan completed two writing courses at Pierpont Community and Technical College. Treat leafminers will beneficial predator insects such as ladybugs, and prevent further infestation with proper plant care and removing older infected leaves. Although lantana and verbena can survive most pests, you may need to intervene if the plant is attacked heavily. Perennial verbenas grow in zones 7 to 11. Botrytis blight Some varieties of Verbena are resistant to powdery mildew, such as the Aztec, Laskar and Tukana series. Small infestations are generally controlled by removing infected leaves and hosing down the plant with a water hose. This innate vigor protects them from some of the disease problems that require a debilitated host. Yet, there is one pathogen group that takes advantage of perfectly healthy plants, … The mites can also cause stunted growth and premature dropping of leaves and buds. A small number of spider mites is generally just an annoyance. Informational table showing disease name, symptoms, pathogen/cause, and management of Verbena diseases. Treat aphids by spraying the bugs off the plant with a blast of water and applying an insecticidal soap. To treat this problem, remove the infected plant matter with a pair of pruning shears and discard in a garbage bag away from the garden. They appear raised as spores are produced. For larger infestations, use horticultural oil, insecticidal soap or beneficial predators such as ladybugs. True bugs generally will not cause serious harm to plants and can be prevented by providing proper care to the plant. The spots turn gray and then darken. Some varieties of Verbena are resistant to powdery mildew, such as the Aztec, Laskar and Tukana series. So, the powdery mildew on your cucumbers may not be the same species as the one affecting your phlox. Both flowers and leaves will become stiff and discolored. One way to test for thrips infestation is to hold a piece of paper under the plant and shake the foliage. These sap-sucking insects will cause leaf discoloration, stunted growth and eventually kill the leaves. Leaves, stems and buds grow distorted as the disease progresses and the plant becomes distorted. Heavily infected leaves may fall off. This variety originated from South America where it is a common sight in most of the warm regions of …

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