The Use of Temperature Accumulations and Sequential Sampling in Predicting Damaging Populations of Blissus leucopterus hirtus1

Autor:	F. L. Mcewen, H. J. Liu
Rok vydání:	1979
Předmět:	education.field_of_study Ecology Chemical treatment Population Negative binomial distribution Biology biology.organism_classification Blissus leucopterus Agronomy Insect Science Sequential sampling education Nymph Ecology Evolution Behavior and Systematics
Zdroj:	Environmental Entomology. 8:512-515
ISSN:	1938-2936 0046-225X
Popis:	The initiation of post-diapause development in Blissus leucopterus hirtus was marked by oogenesis in overwintered females. Its temperature threshold was established as 7°C. Sequential sampling and chemical applications were timed from a knowledge of day degrees accumulated above this threshold to the peak in numbers of 3rd-instar nymphs. The sequential sampling scheme was developed to identify injurious infestations of B. l. hirtus and to recommend or advise against chemical treatment. It was based on the size of the population of 3rd-instar nymphs, sampled at their peak in relation to 2 critical densities. This stage of the insect conforms to a negative binomial distribution with a common k of 0.401. The system proved effective, both in timing and accuracy of prediction, when put into practice on 33 lawns in Guelph, Ontario.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::a84fb28fde9e26c7d75b55c6ac74bbf7 https://doi.org/10.1093/ee/8.3.512 Zobrazit plný text záznamu