As far as the Carrot Museum is aware there are currently no chemical controls recommended for this insect. Highly residual insecticides will kill them sometimes, but not guaranteed and may leave the carrots roots inedible. Standard pesticides will be effective in some cases. Read more about modern pesticides at Wikipedia here
Field Biology and Identification - A moderate size 13 to 17 millimeter (1/2 – 11/16 inch), oblong‑ovate, dark reddish‑brown to black beetle. Wing covers have longitudinal depressed furrows with punctures. Adult beetles over winter in the soil and emerge in the spring to lay eggs. The larvae are C‑shaped and white, resembling common white grubs. They feed on grasses and decaying vegetation in the soil but will attack the roots of crops.
Plant Response and Damage - The second‑brood adults feed two to 13 centimeters (one to five inches) below the surface on sunflower roots. Adult beetles chew on roots leaving a gouged appearance. Large infestations may cause stunting, wilting, and lodging.
Management - Approaches No control is currently recommended for this insect.
The above information herein is supplied with the understanding that no discrimination is intended and that listing of commercial products, necessary to this guide, implies no endorsement by the authors or the Extension Services of Nebraska, Colorado, Wyoming or Montana. Criticism of products or equipment not listed is neither implied nor intended. Due to constantly changing labels, laws and regulations, the Extension Services can assume no liability for the suggested use of chemicals contained herein. Pesticides must be applied legally complying with all label directions and precautions on the pesticide container and any supplemental labelling and rules of state and federal pesticide regulatory agencies. State rules and regulations and special pesticide use allowances may vary from state to state: contact your State Department of Agriculture for the rules, regulations and allowances applicable in your state and locality.
Details of the Beetle:-
Region: With exception to the Deep South area, this beetle can be found throughout North America.
Life cycle: This Beetle only produces one generation each year and hibernates as an adult in the soil.
Physical Description: This beetle appears reddish brown or black in color and has a hard shell with small holes forming lines on its back. Its size is about 1/2 inch long. The eggs are white and are laid in early spring in the soil. The larva is bluish white with a brown head and with a curved shape of about 1 inch long.
Feeding characteristics: As larvae, the beetle chews the roots of a variety of grain crops. As adults, they feel on the stems and toot of host plant, but they seldom do any damage.
Bothynus Gibbosus - Carrot Beetle
Family - Scarabaeidae
Order - Coleoptera
Length - 11 to 16 mm.
Recognition - Oval shaped reddish brown body with light brown hairs coating the underbody.
Habitat - Garden Plants
Behaviour - Herbivore
Residency - United States
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