Learn which plants thrive in your Hardiness Zone with our new interactive map! Avoid using insecticides as much as possible as they will often kill the naturally occurring enemies of scale. Spraying with water should be repeated frequently as needed, focusing in particular on new growth. One way to detect them is to hold a piece of white paper under a branch and then tap the branch sharply. Do not spray with soaps or oils if the temperature exceeds 85 degrees, and always spray in the evening to slow drying time of the soap or oil. Janet McLeod Scott, Former Horticulture Information Specialist, Clemson UniversityJoey Williamson, PhD, HGIC Horticulture Extension Agent, Clemson University. The presence of crawlers can sometimes be determined by sharply tapping an infested twig on a piece of white paper. In a spray … These beautiful bushes are bothered by many insect pests, including the sawfly, whose larvae can be very destructive to rose leaves. See Table 1 for examples of brands and products. They must be applied before thrips enter unopened buds. This product contains a disease-causing bacterium (Bacillus popilliae) that specifically infects the grubs of Japanese beetles. Several caterpillars may feed upon rose foliage, including the corn earworm, eastern tent caterpillar, stinging rose caterpillar and puss caterpillar. Make sure that you spray early in the morning or on cooler days if possible. Southern red mites are more of a problem during cool weather in spring and fall, and their populations drop during summer. Monitor the crawler emergence in the spring with sticky cards, double-faced tape wrapped around a branch, or by putting an infested shoot into a baggie and watching for crawler movement. Metamorphosis is complete: egg, larva, pupa, adult (Borror, Triplehorn and Johnson, 1989). Since many beetles feed mainly at night, the gardener rarely sees them, only the damage that they cause. U.S. National Collection of Scale Insects Photographs Archive, USDA ARS, www.insectimages.org. Control: Various non-chemical control options are available for Japanese beetles. Three species of sawflies, the roseslug (Endelomyia aethiops), bristly roseslug (Cladius difformis), and curled rose sawfly (Allantus cinctus), are pests of roses. They pupate (change to adult form) in late April and May. See Table 1 for examples of brands and products. These insects overwinter as eggs under the waxy covering of the mother. Insecticidal soaps and horticultural oils are effective control options for spider mites, and are essentially nontoxic to humans, wildlife, and pets, and only minimally toxic to beneficial predators. Control: Rose slugs can be controlled by handpicking. Nymphs and adult leafhoppers feed on the undersides of leaves, using their piercing-sucking mouthparts to suck plant sap. Control: Control of thrips is difficult. They can be effective at reducing adult populations, but they should be kept at least 50 feet from the plant(s) that you are trying to protect. Control: Both beneficial insects, such as lacewings and lady beetles, and predatory mites prey on spider mites. If it becomes absolutely essential to spray an insecticide, the following are available in homeowner size packaging: acephate, bifenthrin, cyfluthrin, lambda cyhalothrin, permethrin, or spinosad. They are wedge-shaped and between ¼- to ½-inch long. Repeat treatment every seven to 14 days until you spot no more rose sawfly larvae … Her areas of interest including gardening, genealogy, herbs, literature, travel and spirituality. If you inspect the leaves closely you will see the culprit! Dealing with a Sawfly Problem. Their immature forms, called crawlers, are susceptible, however. The contact insecticide carbaryl (click for sources)) offers good control if sprayed on the whole rose. Whitney Cranshaw, Colorado State University, www.insectimages.org. Control: Insecticidal sprays of Bacillus thuringiensis, acephate, bifenthrin, cyfluthrin, lambda cyhalothrin, malathion, neem oil, permethrin, pyrethrin, or spinosad will control caterpillars. Stem canker can result in plant death. With their showy and often fragrant blooms, roses are easily one of the most popular flowering plants grown in South Carolina. They can live from 30 to 45 days. Higher toxicity insecticides are available. All recommendations for pesticide use are for South Carolina only and were legal at the time of publication, but the status of registration and use patterns are subject to change by action of state and federal regulatory agencies. As the weather cools, the grubs move more deeply into the soil to overwinter (survive the winter). The adults begin emerging from the soil in mid-May and are present through August. See Table 1 for examples of brands and products. Others appear wet and shiny, superficially resembling slugs. The traps have the potential to create more of a problem by attracting numerous beetles to the area. During the months of May and June in the Northeast you may have noticed leaf discoloration in the form of blotches on your rose leaves (Figure 1). David Cappaert, Michigan State University, www.insectimages.org. The adult female deposits eggs within the bark of rose canes in the fall. Feeding on petals may result in petals streaked with silvery-white or brown as well as petals with browning edges. Always be sure to read the pesticide label before purchasing. Many types of insects can infest rose plants; however, the most destructive are aphids, spittle bugs (or frog hoppers), leaf hoppers, rose maggots (or rose midges), sawfly larvae (also called roseslugs), cane borers, cutter bees, gall wasps, scale insects, thrips, weevils and Japanese beetles. Two-spotted spider mites (Tetranychus urticae) and southern red mites (Oligonychus ilicis) are pests on roses in South Carolina. Insecticides are available but timing of sprays is very important. Infrequently caterpillars (immature stage of moths and butterflies) will be found feeding on rose foliage. Avoid using broad spectrum insecticides that will damage the beneficial insect population.
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