Abstract
Application of <i>Bacillus thuringiensis</i> Berliner and nuclear polyhedrosis virus (NPV) against gypsy moth, <i>Lymantria dispar</i> (L.), and Douglas-fir tussock moth, <i>Orgyia pseudotsugata</i> (McDunnough), are reviewed. Applications of <i>B. thuringiensis</i> against gypsy moth started in 1960. Variations in dosage, application rate, number of applications, formulation, and types of spray nozzles were all tested. Single applications of 20 billion international units (BIU) of <i>B. thuringiensis</i>/ha applied with Beecomist<sup>®</sup> nozzles gave sufficient foliage protection. Gypsy moth NPV has been applied at 2.5 × 10<sup>12</sup> polyhedra/ha in 2 different formulations. Both treatments gave foliage protection and reduced the larval population. Applications of 2.5 × 10<sup>11</sup> polyhedra/ha of Douglas-fir tussock moth NPV and 20 BIU/ha of <i>B. thuringiensis</i> in 25% molasses caused larval reductions of greater than 96% in 1973. In recent experiments, application rates, atomization, and formulations have all been varied.
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.
