DEVELOPMENT OF A CHEMICAL CONTROL STRATEGY FOR THE PINE FALSE WEBWORM, ACANTHOLYDA ERYTHROCEPHALA (L.) (HYMENOPTERA: PAMPHILIIDAE)

Autor:	D. Barry Lyons, Geraldine C. Jones, John W. McFarlane, B. V. Helson
Rok vydání:	1993
Předmět:	Larva animal structures Physiology fungi Hymenoptera Biology biology.organism_classification Structural Biology Insect Science Botany Pamphiliidae Acantholyda erythrocephala PEST analysis Chemical control Molecular Biology Ecology Evolution Behavior and Systematics
Zdroj:	The Canadian Entomologist. 125:499-511
ISSN:	1918-3240 0008-347X
DOI:	10.4039/ent125499-3
Popis:	The pine false webworm, Acantholyda erythrocephala (L.) (Hymenoptera: Pamphiliidae), is an introduced sawfly that is becoming increasingly important as a pest of pine plantations in Ontario. Laboratory bioassays of 10 insecticides, applied to excised pine branches containing eggs immediately prior to hatching, indicated that carbaryl and permethrin at low dosages were efficacious in controlling larvae. Neither carbaryl nor permethrin affected egg hatch, and field trials at various dosages indicated that 500 g AI per ha of carbaryl significantly reduced larval numbers and mitigated defoliation of 1-year-old and current-year foliage. Comparisons of single early (during egg hatch), single late (mean instar about 3.8), and combinations of early and late applications of lower concentrations of both chemicals suggested that the late application better reduced webworm populations. All tested application rates of permethrin and carbaryl provided significant foliar protection, particularly to current-year foliage. Dosages as low as 35 g AI per ha of permethrin and 125 g AI per ha of carbaryl in mistblower applications of third- and fourth-instar larvae may provide suitable protection, depending on management objectives. Ground applications using a mistblower resulted in no differences in efficacy on branches from different vertical strata, but reduced efficacy was observed on branches on the sides of the trees opposite where sprays were applied. Spray drift tests with carbaryl at 500 g AI per ha indicated that some population reduction occurred in trees up to two 2.1-m-spaced rows downwind from treated trees. Thus, each row would not need to be sprayed in operational programs.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::d9e3f2d4e17d04d6f19aa9dad3214f21 https://doi.org/10.4039/ent125499-3 Zobrazit plný text záznamu