Abstract
Abstract Three experiments, including rye cover crop, soil and tobacco seedling treatments, were carried out in a Fox loamy sand field at the Research Station, Agriculture Canada, Delhi, Ontario. Plots measured 76 × 14ft and were arranged in a randomized block design with 3 replications in each experiment. Each plot consisted of 4 rows of tobacco wiih 38 plants in each row, the outside 2 rows in each plot being guard rows. Tobacco seedlings were transplanted on 28 May. Furthermore, 2 subplots (12 × 12 inches each) were established in each plot. Test insects were 4th- and 5th-stage larvae for rye treatment and 6th- and 7th-stage larvae for soil and tobacco seedling treatments. The insecticides were broadcast evenly on the rye cover crop on 18 Apr, soil surface on 16 May, and on tobacco seedlings on 5 Jun, using a power sprayer equipped with 80-04 Tee Jet nozzles applying 25 gal of liquid per acre at 3.5 mph and 32 psi. Ten larvae were placed in each subplot 2 h before treatment. The larvae were retained in the subplots by aluminum barrier strips 8 inches high with 3 inches embedded in the ground to prevent the larvae of the darksided cutworm from escaping. Mortality counts of the larvae in the subplots were made daily for 5 days.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
