An Insecticidal-Check Study of the Biological Control of Puncturvine ( Tribulus terrestris ) by Imported Weevils, Microlarinus lareynii and M. lypriformis (Col.: Curculionidae)

Autor:	Richard D. Goeden, Reed L. Kirkland
Rok vydání:	1978
Předmět:	Tribulus terrestris Ecology biology Weevil fungi Water stress Biological pest control food and beverages Growing season Microlarinus biology.organism_classification Horticulture Insect Science Curculionidae Botany Ecology Evolution Behavior and Systematics
Zdroj:	Environmental Entomology. 7:349-354
ISSN:	1938-2936 0046-225X
DOI:	10.1093/ee/7.3.349
Popis:	To assess the impact of Microlarinus lareynii (Jacquilin du Val) and M. lypriformis (Wollaston) on puncturevine ( Tribulus terrestris L.), half of the plants in irrigated and non irrigated plots were dusted weekly with 10% Diazinon® insecticide to protect them from weevil attack. The mortality, flower, and seed production, and stem lengths (radii) of insecticide-treated and untreated plants in these plots were then compared throughout the 1974 growing season. Water stress apparently was the principle cause of early-season plant mortality; however, weevil attack caused a 60% reduction in flower production on surviving plants in nonirrigated subplots. Moreover, only half of the flowers on these unprotected plants in nonirrigated sub-plots produced fruit late in the growing season. The mean number of seed/fruit from August onwards also was significantly reduced by weevil attack. Stem growth was exponential during June and July in irrigated plots, but was slower and ceased 2–3 wk earlier in nonirrigated plots where the suppressing effect of weevil attack was especially evident.
Databáze:	OpenAIRE
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