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Passive traps, or circle traps on the trunk or pyramid traps at one per acre, can be used to capture ascending weevils. Figure 2. spines of the bur. for 20 to 30 minutes to kill larvae in the nuts. Photo by Jerry A. Payne, USDA Agricultural Research Service, Bugwood.org. However, based on research out of Kentucky and Missouri as well as the experience of Michigan growers, we can make some educated estimations about the chestnut weevils lifecycles under Michigan conditions. Tribe Curculionini differes from other weevils, and from other Coleoptera, by the unique cone-shaped mandibles that move vertically instead of horizontally. Michigan State University Extension cautions against applying pesticides during adult activity in May-June during lesser chestnut weevil spring adult emergence as bees are often foraging in the orchard at that time. emerge from the soil in Photos by Jennifer C. Giron Douque, University of Puerto Rico, Bugwood.org. We protect and manage the fish, forest, and wildlife of the state. Scouting locations should include both the edges and interior of orchards as well as any hotspots that are identified. sound when put into storage, some will soon show obvious signs of infestation. A cold treatment, holding nuts

[4] These weevils lay After two to three weeks, larvae chew an exit hole in the nutshell and drop to the soil.

Weevils that emerge in the spring can be observed feeding on catkins. Lesser chestnut weevils are 0.25 inches in length, with a snout of equal or greater length. University of Kentucky ENTFACT-206 by Ricardo chestnut hybrids are generally resistant, but not necessarily immune to blight. Learn more about this and other weevils on their group page. The larvae feed within the nut, compromising the kernel. Department of Horticulture and Landscape Architecture, Purdue University. Left/top: Chestnut weevil eggs in chestnut flesh. One female can lay up to 20-30 eggs. Eggs hatch in about 10 days and larval development is completed two to
An equal access, equal opportunity university. Nut weevil larvae eat the nutmeats of acorns, hickory, or other nuts, then bore out of the nut, drop to the ground, and live in the soil before pupating and emerging in spring as an adult. chestnut hybrids are generally resistant, but not necessarily immune to blight. ) As chestnut harvest begins in some areas of Michigan, there are reports of weevil issues in orchards. Although harvested nuts may appear Ideally, a combination of cultural and chemical management would control the pest and eliminate the need for post-harvest treatment, which can diminish quality and the marketable yield. Photos by Jennifer C. Giron Douque, University of Puerto Rico, Bugwood.org. Carefully budget the three to four applications of carbaryl available as the period of burr exposure is long. weevils can be scouted and monitored for their presence by jarring the tree and Sanitation can help reduce weevil populations.

According to some investigations, shell thickness is not correlated with the level of weevil damage, but nuts whose shells harden rapidly may be resistant to weevil attack to some extent.[9]. Soon after, the weevil larva inside chews a small hole into the acorn seed and leaves the empty acorn, burrowing into the soil. Basic control of this weevil is spraying the orchards with insecticides (containing for example methomyl, thiaclopride, deltamethrine). 130, by F.E. Infested nuts remain on the tree while the developing larvae consume the kernel. Life cycle of acorn weevils. eggs. The adults feed on nuts and live for several weeks.

The Rhynchophora of America, North of Mexico.

due to chestnut blight, caused by the fungus, Today https://entomology.ca.uky.edu/ef206, University of Missouri, Center for Agroforestry. The natural range of these pests mirrors the natural range of American chestnut (Castanea dentata) in the central and eastern United States.

To have a digest of information delivered straight to your email inbox, visit https://extension.msu.edu/newsletters. Scouting for chestnut weevils should begin just before bloom. If left unchecked, these weevils can infest and destroy the majority of nuts produced in an orchard. Collect The larvae feed within the nut, compromising the kernel. At one time American chestnuts dominated the Jeffrey W. Dwyer, Director, MSU Extension, East Lansing, MI 48824. They are also popular food for Moreover, adult overwintering diapause could be energetically more costly than larval diapause, but could in turn allow adults to be better synchronized with their host plants.[6]. The insect remains in the soil for two to three years before re-emerging female weevil uses her long proboscis to drill a hole through the shell before counting fallen weevils.

Newly formed adults then mainly overwinter in their pupal cases before emerging in the spring of the following year. Adults feed on chestnut foliage until nut kernels enter [7] This nematode is deadly to full-grown larvae that inhabit the soil under the tree canopy. Weevils that emerge in the spring can be observed feeding on catkins. This species is often confused with another commonly occurring weevil of the same genera – the gland weevil, Curculio glandium, which lives on oaks. MSU is an affirmative-action, equal-opportunity employer. 303 LIFE HISTORY OF BOTH SPECIES.

tree. The pudgy larva develops inside the nut. Brooks and R.T. Cotton. Jarring the branch causes the weevils to drop from the tree onto the sheet. Ideally, a combination of cultural and chemical management would control the pest and eliminate the need for post-harvest treatment, which can diminish quality and the marketable yield. The Scouting locations should include both the edges and interior of orchards as well as any hotspots that are identified. November 14, 2014. Insecticide applications for control should target the two later windows of potential adult activity; August-September for large chestnut weevil adult emergence, and September-October for lesser chestnut weevil fall adult emergence. turning around and placing her ovipositor into the nut and laying five to seven Michigan State University Extension programs and materials are open to all without regard to race, color, national origin, gender, gender identity, religion, age, height, weight, disability, political beliefs, sexual orientation, marital status, family status or veteran status. The most important insect pest of chestnut trees in the central-eastern United States is the lesser chestnut weevil (Curculio sayi).

Unfortunately, most American chestnuts died When the acorns fall to the ground in autumn, the larva chews a perfectly round 1/8 inch hole in the nut and emerges in late fall or early winter.

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