However, you may sometimes be surprised to find holes or other basil leaf damage in basil leaves . Damage. Leafhoppers. Damage to basil by root-knotnematode 6 7. Leafhoppers can be common insects of lawns. Leafhoppers range in size up to about 10 mm long and have five nymphal instars; all stages feed on the aerial parts of the plant, nymphs and adults feeding on the same plants. Chilling injury ofharvested basil 7 Affected turfgrass lose vigor and may die as a result of extended presence of high populations. Damage is cumulative, resulting in a leaf that looks like the green color has been increasingly sand-blasted (Figure 2). Figure 1. All basil is heat- and sun-loving, regardless of variety. Phyllis G. Weintraub, in Insect Pests of Potato, 2013. Although leafhopper sightings are not uncommon on golf courses and lawns, severe injury usually occurs only with large leafhopper populations. Basil, Ocimum basilicum, is a short lived annual or perennial plant in the family Lamiaceae grown for its leaves which are used as a herb.The basil plant grows from a thick taproot and has silky green opposite (paired) oval leaves which grow to be 3–11 cm (1.2–4.3 in) long and 1–6 cm (0.4–2.4 in), branching out from the central stem. Fusarium disease ofbasil 5 6. Chinese ro.se beetle damage to basil 2 2. French. Depending on species they may be green, brown or yellow in color and often have colorful markings. Figure 2. Photo courtesy of J.M. Both adults and nymphs run sideways and are good jumpers. A native of central Asia and northwest India, basil is a member of the mint family. Nymphs do not have wings and are generally lighter in color than adults. Leafhoppers overwinter as adults and are found in spring on basal grape leaves and weeds. Brasilian leafhopper damage to basil 4 4. Originating from India, basil plant leaves may be found in a plethora of cuisines from Italian to Thai and can be used to flavor foods, vinegars, oils, teas, and even to scent soap. Their color is variable but many of the more common turfgrass species are generally light colored or brown. The adult grape leafhopper is about 0.12 inch (3 mm) long and light to pale yellow with distinct dark brown and reddish markings. Both nymphs and adults suck sap from the leaves, resulting in yellowing or bleaching. If the pests eating your basil leaves are a species of leafhopper, you will see the channels they dig in before you see the small insects, each less than 1/4 inch long, with neutral tan coloring. Leafhoppers damage is often insignificant. Sage leafhopper damage increased brightness and yellowness but decreased greenness of the oregano herbage. Leafhopper. Adult potato leafhopper Damage: Both the adults and the numphs feed on the underside of the potato leaves causing a stippling or speckling of the leaf surface called "hopper bum". The edges of the leaves curl down ward, first turning lighter green, then yel- low, and finally brown and necrotic. As feeding and injury continues, the turf begins to dry out and gradually turns from yellow to brown. Deal with leafhoppers by spraying the plant with horticultural oil, neem oil, or insecticidal soap. Grape leafhopper. Slug damage to basil 3 3. Example of leafhopper damage on grape leaves: “light” (top left), “moderate” (top right), and “heavy” (bottom, center). Leafspots caused by Colletotrichum sp 5 5. Leafhopper adults (1/4 inch long) are slender, wedge-shaped insects that fly or disperse rapidly when disturbed. Early leafhopper damage often appears as a graying or silvering of infested turf areas. 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