Rose curculios seem to prefer white or yellow roses, so keep a close eye on these plants. If ants are present, they should be controlled. You can control them with Bt or by releasing trichogramma wasps (they prey on caterpillar eggs). Damage to Terminalia catappa (tropical or Pacific almond) by rose beetle, Adoretus versutus. They occasionally feed on the foliage or flowers of roses. Dark, purple, pimple-like spots on the bark indicate the presence of eggs. The adult beetles (Photos 1&2) do the damage, feeding in the early hours of the night. Brown oval eggs (1.5-2 mm long) are laid singly in the soil at a depth of 7-10 cm. With the fuller rose beetle, the leaf damage is typically serrated (notched edges), creating a ragged appearance. Often, more than one control option is available for a pest. For information on diseases of roses, see HGIC 2106, Rose Diseases. Remove the soil to a depth of 10 cm from
Upon killing the grubs, even more of the milky spore is generated, thus helping to kill even more grubs. Photo 1&2 Gerald McCormack, Cook Islands Biodiversity & Natural Heritage (http://cookislands.bishopmuseum.org/). Control: No control is recommended because the damage caused by leafcutting bees is minimal, and the bees are important as pollinators. Insecticidal soaps will help control thrips, but thorough coverage is necessary. Classic, versatile roses (Rosa spp.) NATURAL ENEMIESA scoliid wasp, Micromeriella margiinella modesta, was introduced into Fiji from Hawaii in 1917, and later into Samoa (1955) and Solomon Islands (1984). QUARANTINEThere are some Pacific island countries where the rose beetle is not yet present. Higher toxicity insecticides are available. Part of figuring out the pest we have is in recognition of the damage the particular insect does. Spraying an insecticide (such as Sevin) for control of rose weevils as a last resort will usually produce good results on the adult beetles with some control of the larvae. Insecticidal soap and horticultural oil are also effective against rose slugs. Japanese beetle traps are available commercially, but should be used with caution. Rose scales are usually found on rose canes where they feed on sap with their piercing-sucking mouthparts. Sign up to get all the latest gardening tips! Bayer Advanced Garden 12 Month Tree & Shrub Insect Control Conc. It has spindly legs and is black underneath. An adult Japanese beetle is about ½ inch long and has a metallic green body and legs with coppery-brown wing covers. © Copyright 2020 Hearst Communications, Inc. Jack Hollingsworth/Digital Vision/Getty Images. The rose genus contains many species and hundreds of cultivars of roses suitable in such a variety of U.S. Department of Agriculture plant hardiness zones that gardeners in every zone can easily find a rose suited to their yards. Predatory mites are about the same size as spider mites but can be distinguished from spider mites by their long legs and the speed with which they move. The hoplia, rose fuller, rose chafer and Japanese beetles are common beetles that feed on the tender portions of rose plants. Sprays containing bifenthrin, cyfluthrin, horticultural oil, lambda cyhalothrin, malathion, neem oil, permethrin, or pyrethrin will control aphids. However, as the adults are strong fliers, they can fly in from nearby lawns and pastures.
Japanese beetles have chewing mouthparts and feed on flowers, buds and leaves of roses (as well as numerous other plant species). ; &RTS, Spectracide Malathion Insect Spray Concentrate, Bonide Neem Oil Fungicide, Miticide, Insecticide Concentrate, Bonide Eight Insect Control Vegetable, Fruit & Flower Concentrate, Southern Ag Conserve Naturalyte Insect Control Concentrate, Bayer Advanced 3-in-1 Insect, Disease & Mite Control Conc. Adult female thrips of both species are tiny, yellowish-brown insects with fringed or feathery wings. This stunning genus consists of about 150 species that grow throughout U.S. Department of Agriculture plant hardiness zones 2 through 11, depending on the variety. See Table 1 for examples of brands and products. Tonga has
Photo 7. Infrequently caterpillars (immature stage of moths and butterflies) will be found feeding on rose foliage. Early recognition of such a problem is priceless, making the treatment of fuller rose beetles imperative. Three species of sawflies, the roseslug (Endelomyia aethiops), bristly roseslug (Cladius difformis), and curled rose sawfly (Allantus cinctus), are pests of roses. damage on roses. Some people have had success with rose beetle traps. Weevils can be a problem in the rose garden, destroying the beauty of the plant's flowers and foliage. If you really want to use them, I would place them at the far end of your property and far away from anything they can damage.
Their natural enemies tend to keep aphid populations under control except in cool weather. Spraying and killing the adult beetles prior to them laying their eggs to start the cycle all over again is of great importance as well. Horticultural oil sprays (also called supreme, superior or summer oils) work well to control armored scales, such as the rose scale, by penetrating their waxy covers and smothering them. The larvae generally reach about ½-to ¾-inch in length. A light presence of this beetle can be controlled by hand picking them off and dropping them into a bucket of soapy water to help break the chain of egg laying and more larvae dropping to the soil below. You may need to treat plants more than once when rose chafers are numerous. By: Stan V. Griep, American Rose Society Consulting Master Rosarian, Rocky Mountain District. Whenever possible, physical control measures should be tried first. When growing roses, the use of broad-spectrum insecticides should be avoided as much as possible as these products can kill off natural enemies that help keep spider mite populations in check.