Factors Involved in Carbaryl-Induced Population Buildups of Myzus persicae ( Sulzer ) ( Homoptera : Aphididae ) on Potato '

Content Provider	Semantic Scholar
Author	Ferguson, Jeffrey S. Chapman, Keith
Copyright Year	2009
Abstract	The phenomenon ol'populatioJl buildups of green peach aphid (CPA), MYZllS persi<:ae (Sulzer), on potato following foliar applications of the insecticide carbaryl (I·naphthyl methy1carbamatc) was examined in the field and laboratory. In field tests, weekly applications of carbaryl at a label rate of 1.12 kg (Al)lha and ,IX ratc (4.48 kg (AII/ha) resulted in significantly higher GPA population densities than in untreated plots, with peak densities more than len times those in the untreated control. The greatest ell'cd was seen after 3-4 weekly applications. In 1980, CPA population densities were similar in plots treated with carbaryl at 1.12 and 4.48 kg/ha, while in 1981 population densities were significantly higher with the 4.48 kg (AI)lha rate. Carbaryl only slightly reduced population densities of coccinellids and delayed their population buildups by about 1. wk, while chrysopid numbers were similar in treated and untreated plots. Aphid parasitization was low « 3%) in both carbm·yl·treated and untreated potatoes. Predator counts in field and exclusion cage trials showed that CPA population density increases in carbaryl-treated potatoes were not primarily due to natural enemy reduction. In laboratory experimcnts, adult CPA placed on potato leavcs treated with carbm'yl at 500 and 1000 ppm produced significantly more nymphs/day than at 250 and 0 ppm, indicating that stimulation of reproduction is the primary factor responsible fOl' increases in population density. Additionally, carbaryl mny improve the nutritional quality of potato foliage to aphids by increasing the nitrogen content. '.
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://scentsoc.org/Volumes/JAE/v10/1/00101051.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article