Abstract
Field-aged residues of avermectin B, on apple and pear foliage were bioassayed at intervals for activity against two mite species, European red mite (Panonychus ulmi (Koch)) and twospotted spider mite (Tetranychus urticae Koch). Initial mortality was nearly 100% for both mite species on treated leaves of both tree species, and declined to 0-63% (1987) and 16-85% (1988) after 14 d. In both years, the mortality on treated apple foliage declined more quickly than that on pear. The main effect of tree species was significant at 1, 3, 7, and 14 d after treatment in 1987, and at 7 and 14 d after treatment in 1988. The main effect of mite species on mortality was not significant 3 d after treatment. Observed differences in field trial performance of avermectin B, were apparently caused by differences inherent between apple and pear rather than the mite species that normally infest them.
Sign-in/Register to access full text options 
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.
