| impact of bemisia whiteflies (homoptera: aleyrodidae) on alfalfa growth, forage yield, and quality. | a 3-yr project was initiated in 1993 to examine the effects of insecticides and sustained whitefly, bemisia argentifolii bellows & perring [aka. b tabaci gennadius (strain b)], feeding on alfalfa plant growth and vigor in greenhouse cage studies, and to determine the impact of natural bemisia whitefly populations on alfalfa forage yields and quality in a large-plot field experiment. alfalfa plant growth and vigor after exposure to imidacloprid and a mixture of fenpropathrin and acephate insectic ... | 2000 | 11142299 |
| effects of planting pattern of collards on resistance to whiteflies (homoptera: aleyrodidae) and on parasitoid abundance. | fourteen collard entries, brassica oleraceae l., acephala group, were evaluated for resistance to natural populations of bemisia argentifolii bellows & perring in replicated field plots in charleston, sc. glossy-leaf phenotypes ('sc glaze', 'sc landrace,' 'green glaze') were the most resistant collard entries and had fewer whiteflies than the nonglossy, open-pollinated cultivars. also, two f1 hybrid cultivars with normal, nonglossy leaves ('blue max' and 'top bunch') were resistant. in laborator ... | 2000 | 10985035 |
| selection for fenpropathrin and fenpropathrin + acephate resistance in the silverleaf whitefly (homoptera: aleyrodidae). | a large, genetically diverse pool of bemisia argentifolii bellows & perring was collected in 1994 from different crops, and a mixed colony was established in the laboratory. subsets of this colony were reared on cotton plants held in large plexiglas cages, and adult whiteflies were selected for resistance to fenpropathrin and to fenpropathrin + acephate (1:5). selection was performed by exposing adults to treated glass vials at doses sufficient to give 60-80% mortality. thirteen generations of a ... | 2000 | 10902354 |
| comparison of greenhouse screening materials for excluding whitefly (homoptera: aleyrodidae) and thrips (thysanoptera: thripidae). | twenty-eight greenhouse screening materials, with predetermined airflow resistance values, were evaluated for exclusion of the silverleaf whitefly bemisia argentifolii perring & bellows and thrips from a mixed-species population. screens differed in exclusion efficacy, expressed as a percentage of the fiberglass window screen control and at an approach velocity of 92 m/min, from -35 to 94% for silverleaf whitefly and from -13 to 95% for thrips. seventeen screens excluded more silverleaf whitefly ... | 2000 | 10902333 |
| genetic analysis of bemisia (hemiptera: aleyrodidae) populations by isoelectric focusing electrophoresis. | twenty-one whitefly populations in the genus bemisia were evaluated for genetic variation at 3 allozyme loci. nine of the 22 populations that exhibited polymorphic loci were subjected to allozyme analysis using a minimum of 10 enzymes, representing 10 to 14 distinct loci. among those nine variants examined, calculated genetic distances ranged between 0.03 and 0.52, with three main groups emerging from the analysis. one group comprised two closely related western hemisphere variants of b. tabaci: ... | 2000 | 10862356 |
| whitefly (hemiptera: aleyrodidae) binding site for imidacloprid and related insecticides: a putative nicotinic acetylcholine receptor. | imidacloprid is used extensively to control sweetpotato whiteflies, bemisia argentifolii bellows & perring [also known as b. tabaci (gennadius) biotype b]. as a radioligand, [3h]imidacloprid binds rapidly to a single class of high-affinity sites in membrane preparations from whole adult whiteflies with an apparent dissociation constant of 2 nm and maximal binding capacity of 101 fmol/mg protein. three related compounds (the nitromethylene analog of imidacloprid, acetamiprid, and nitenpyram) inhi ... | 1997 | 9260539 |