By contrast, the same sort of survey conducted in a nursery where pesticides were not used yielded 950 predator insects and only 3 Black Vine Weevil. They live below the soil surface, and feed on roots and cambium at the base of the trunk. Strawberry root weevil (Otiorhynchus ovatus) is the most common home-invading weevil in Minnesota.You may find these weevils indoors from the end of June through August. Adult vine weevils cause notch like leaf damage, which can be unsightly but rarely affects plant growth. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Assemble an arsenal of natural barriers, substances and insect allies to help keep these pests under control. [4] They are simply mixed with water, and watered onto the soil. After adults emerge, spring applications of insecticides are recommended in order to control adults before eggs are laid. They live in the soil and hunt down susceptible insects to attack. Nemasys Vine Weevil Killer can be applied to pots or direct to the soil anytime from March to November. Black vine weevil adult. They often lie in a sort of "C" shape. However, the real damage is done by the vine weevil's larvae: creamy-white grubs that are curled up into C-shape and have a light brown head.Tiny to start with, they grow to about 1 cm in size and in order to do so, they feed on roots. Naturally, this will not get rid of all of them. This weevil attacks both roots as a grub and leaves. Within this group the shorter persistence pesticides (that are usually certified for organic growing) are likely to be less damaging to non-target wildlife than those with longer persistence and/or systemic action. If they appear eaten, then search the surrounding soil and destroy any vine weevil larvae that you find. There are many options for eradicating the adult insect pests. Check your trap every few days. Vine Weevil Larvae are … They range in color from light gray to deep black. It may be a bit expensive to get started with nematodes; however, once established, they will continue to reproduce and spread throughout the soil of your garden. Females lay several eggs every day on nearby suitable host plants. Do not apply chemicals to fruit and vegetables and keep chemicals away from water courses, where fish and other water life might suffer as a result of pollution. There are several other species of weevil closely related to vine weevil, such as the privet weevil Otiorhynchus crataegi and the recently arrived O. armadillo. They can completely girdle a plant or tree. We use cookies on this website. As the larvae grow and develop over the summer, they attain a size of approximately 5∕8 inch. The treatment consists of natural nematodes, a tiny parasitic worm that feeds on the vine weevil larvae. The larvae are a bit bigger than the mature adults. For the most effective control, simply add the nematodes to a watering can and apply directly to the open soil or directly to pots, tubs and containers. These eat the roots of a wide range of plants and can bore into tubers of cyclamen and begonia, and into stem bases of cacti and succulents. Plants that do not appear to be growing as well as they should, are sure signs that the vine weevil grubs may be active below ground. A Vine weevils (Otiorhyncus sulcatus) are brownish-black insects, around 1cm long, with jointed antennae and pale-brown flecks on their backs.Like aphids, the females do not need males to reproduce, so it only takes one weevil to start an infestation. Nemasys Vine Weevil Killer is both safe and highly effective in the control of vine weevil grubs. Bug Clear Ultra Vine Weevil Killer) as a liquid drench applied to the compost. This insecticide gives protection against the grubs for up four months; treatment in mid- to late summer will control the young larvae and prevent damage occurring later in the autumn to spring period. They will basically eat any insect they can grab and consume. Affected plants will begin to wilt and eventually die, or they may appear to have stunted growth as a result of grubs damaging the roots, rendering them less efficient. Then treat the surrounding soil with nematodes during the summer months to control any larvae that appear. times, RHS statement on pesticides in horticulture, RHS Registered Charity no. Adult pests usually die when the cold weather comes, but if they are able to find a place to hide indoors, they may last the winter and reproduce again. Nematode reapplication during the time periods when black vine weevil larvae are most active and destructive. The larvae feed on the roots of plants and are especially fond of hemlock types of plants. Be willing to accept a small amount of weevil feeding on the leaves of your plants as this lets you know that you still have enough weevils to keep your natural predator friends well fed. However, the adults will still be wreaking havoc during the nights as they fly from plant to plant laying their eggs. Thiacloprid (in liquid form as a soil drench). Gardeners with vine weevil should keep up their guard because stopping control measures after the apparent disappearance of the weevil can allow numbers to build up again. This is unlikely, however, since nematodes eat lots of different kinds of earth dwelling pests. Using a basic watering can, the nematodes can be applied to the soil between March and October. There is only one generation per year. Where it will quickly die and the pests will go their merry way to other plants. If you see adult black vine beetles underneath, you know that you have a problem. It was once thought that nematodes could not survive in the cold soil of the northern United States or Canada, but naturally occurring populations of them have been found there.