A series of field trials evaluated the efficacy of the entomopathogenic nematode, Steinernema carpocapsae Weiser All strain for control of western corn rootworm, Diabrotica virgifera virgifera LeConte, larvae. Separate trials examined the effects of nematode application rate and timing on corn rootworm control in 1991. In the rate trial, S. carpocapsae (0, 104, 105, 106, and 107 nematodes per 30.5 row-cm) was applied as the insect population entered the second instar. Nematode treatment significantly reduced corn root injury and adult emergence. High application rates (106 and 107 nematodes per 30.5 row-cm) significantly outperformed low rates (104 and 105 nematodes per 30.5 row-cm). Nematode treatment (500,000 S. carpocapsae per 30.5 row-cm) reduced root injury and adult emergence slightly in the timing trial; later applications (second, third instar) were numerically, but not significantly, more effective than early (egg, first instar) ones. In 1992, a factorial trial combined four application dates (egg; first, second, third instar) and five rates (0, 104, 105, 106, 107 S. carpocapsae per 30.5 row-cm). Later applications (second, and particularly, third instar) were significantly more effective than early (egg, first instar) ones. Root injury and adult emergence in control and low rate (104 and 105 nematodes per 30.5 row-cm) plots significantly exceeded that in high rate (106 and 107 nematodes per 30.5 row-cm) plots. Commercially acceptable root protection (root injury ratings below 3.0) was provided by 106 nematodes per 30.5 cm of row applied to third instars, and by 107 nematodes per 30.5 cm of row applied to second and third instars.
You have requested a machine translation of selected content from our databases. This functionality is provided solely for your convenience and is in no way intended to replace human translation. Neither BioOne nor the owners and publishers of the content make, and they explicitly disclaim, any express or implied representations or warranties of any kind, including, without limitation, representations and warranties as to the functionality of the translation feature or the accuracy or completeness of the translations.
Translations are not retained in our system. Your use of this feature and the translations is subject to all use restrictions contained in the Terms and Conditions of Use of the BioOne website.