Feeding by C. pulicaria causes irregular, fine, white scratches on the leaves of maize plants (Poos and Elliott, ). The insect eats through the epidermis of the. Genus Chaetocnema. Species pulicaria (Corn Flea Beetle). Synonyms and other taxonomic changes. Chaetocnema pulicaria F.E. Melsheimer. Description The adult is a very small, smooth, shiny, roundish, black beetle. The hind legs are distinctly enlarged and thickened, and the beetles jump readily.
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Views Read Edit View history. After mating, the females lay their eggs on plant leaves or in the ground, on or near underground stems and roots. The disease organism is Pantoea stewartii. They also transmit Stewart’s wilt ; by removing the leaf tissue from the plant, they open a wound which allows the disease to begin spreading from plant to plant.
Luring June and August, when the newly emerged adults appear, the leaves of corn may be partly covered with their feeding scars. Agrostis gigantea black chaetocnsma.
Chaetocnema pulicaria (corn)
During the growing season, more C. However, in years when flea beetles are abundant and the disease is widely disseminated, some varieties of corn will wilt and the plants may die before tasseling. Systemic infection is affected by host reaction and the growth stage at the time of infection. Most varieties of commercial field corn are resistant to this diseases. The larvae feed especially on plants’ rootscausing serious damage.
Dedicated naturalists volunteer their time and resources here to provide this service. It is able to develop and reproduce on secondary hosts.
Yields of resistant or moderately resistant hybrids were rarely affected when infection chaetocneka after the V3 stage Suparyono and Pataky, In addition, knowledge concerning the seasonalities of the first and second population peaks of C pulicaria during the corn growing season could be used to recommend optimal timing for foliar-applied insecticide applications.
Resistant hybrids may not prevent systemic infection or main stalk death when flea beetles feed on the leaf tissue close to the growing point before the V2 or V3 stage Pataky et al.
Scouting Procedures Examine newly emerged corn for the pulcaria of the beetles and count the approximate number per plant.
The eggs hatch in 7 to 14 days into larvae. A large percentage of sweet corn plants infested in the seedling stage will die or dwarf and produce no harvestable ears.
It becomes active early in the spring and even feeds on grasses on warm days during the winter. In Illinois, the larvae complete growth, pupate, and emerge as adults during June.
Knowledge Bank home Change location. In other projects Wikimedia Commons. When conditions are favorable for both the beetles and the wilt, nearly percent of the susceptible varieties of field corn will show symptoms of Stewart’s disease by late fall.
Modifications to the Stevens-Boewe system of forecasting Stewart’s wilt have been proposed Esker and Nutter, ; Esker et al.
Yield reduction is significantly higher due to early season systemic infection in susceptible and moderately susceptible hybrids Suparyono and Pataky, ; Freeman and Pataky, Host-Plant Resistance Plants are not resistant to the flea beetle or its feeding.
If you need expert professional advice, contact your local extension office. Photos of insects and people from the gathering in ArizonaJuly Photos of insects and people from the gathering in Alabama Photos of insects and people from the gathering in Iowa Photos from the Workshop in Chaetocne,a, Iowa Photos from the gathering pulicagia Washington.
When infection occurred at later growth stages V7 to V9 or lateryield was not as greatly reduced. A disease forecasting system is used to predict flea beetle survival and subsequently, the risk of Stewart’s wilt for the following crop season Stevens, ; Boewe, ; Eastburn, ; Ries and Pataky, ; Esker, ; Cook, Go to distribution map An action threshold used in the north-eastern USA is six adults per maize plants Adams and Los, ; Hoffman et al.
At later growth stages, Stewart’s wilt ratings were lower and resistance was thought to be more effective because infection sites were farther from the growing point and movement of the bacterium was limited.
The larvae are small, white, and not very active. EU pesticides database www. Stewart’s wilt symptoms begin at the site of the feeding scars. Articles with ‘species’ microformats. The females lay pu,icaria in soilwhich has plants growing nearby. Corn Flea Beetle Chaetocnema pulicaria.
corn flea beetle (Chaetocnema pulicaria)
Generally, field corn infested with Stewart’s disease will uplicaria little sign of disease until late in the summer when numerous leaf lesions will appear on the leaves. Periods that ranged from 14 to 32 d were observed in and when C. The species is black in color, with orange legs and antennae.