scholarly journals Differences in spatial distribution and life history parameters of two sympatric whiteflies, the greenhouse whitefly (Trialeurodes vaporariorum Westwood) and the silverleaf whitefly (Bemisia argentifolii Bellows & Perring), under greenhouse and laborator conditions

1998 ◽  
Vol 33 (3) ◽  
pp. 379-383 ◽  
Author(s):  
Hirotsugu Tsueda ◽  
Koji Tsuchida
Keyword(s):  
Spatial Distribution ◽  
Life History ◽  
Trialeurodes Vaporariorum ◽  
Silverleaf Whitefly ◽  
Bemisia Argentifolii ◽  
Greenhouse Whitefly ◽  
Life History Parameters

scholarly journals 157 Susceptibility of Poinsettia Cultivars to Whiteflies

HortScience ◽  
2000 ◽  
Vol 35 (3) ◽  
pp. 417A-417
Author(s):  
Robert P. Rice ◽  
Michael Crane
Keyword(s):  
Trialeurodes Vaporariorum ◽  
Natural Resistance ◽  
Euphorbia Pulcherrima ◽  
Silverleaf Whitefly ◽  
Bemisia Argentifolii ◽  
Immature Stages ◽  
Trichome Density ◽  
Greenhouse Whitefly ◽  
Wide Range ◽  
Leaf Trichome

Twenty-four poinsettia cultivars (Euphorbia pulcherrima) were exposed to a population of greenhouse whitefly (Trialeurodes vaporariorum) and silverleaf whitefly (Bemisia argentifolii) for 6 weeks. Evaluation was based on the number of immature whitefly present on each of the marked leaves. The poinsettias that produce white bracts were more heavily infested with immature stages of whitefly than those cultivars that produce red bracts, while those that produce pink bracts were intermediate. There was a wide range in degree of whitefly infestation among poinsettia cultivars. Leaf trichome density also explained a portion of the variance in whitefly oviposition rates among several of the cultivars. Cultivars with high trichome densities sustained less whitefly oviposition than did cultivars with low trichome densities. Certain cultivars tested showed an appreciable natural resistance to whitefly (`Freedom Red', `Freedom Bright Red', `Red Velvet', `Cranberry Punch', `Pepride').

Life-history parameters of different biotypes ofBemisia tabaci(Hemiptera: Aleyrodidae) in relation to temperature and host plant: a selective review

1998 ◽  
Vol 88 (3) ◽  
pp. 219-230 ◽  
Author(s):  
Y.C. Drost ◽  
J.C. van Lenteren ◽  
H.J.W. van Roermund
Keyword(s):  
Life History ◽  
Trialeurodes Vaporariorum ◽  
Development Rate ◽  
Adult Longevity ◽  
Temperature Dependent ◽  
Greenhouse Whitefly ◽  
Life History Parameters ◽  
Different Populations ◽  
Biotype B ◽  
Rate Development

AbstractLife-history parameters of different biotypes of the whiteflyBemisia tabaci(Gennadius) species complex were reviewed. This included the B-biotype ofB. tabaci, identified asB. argentifolii(Bellows & Perring). Comparisons were made among different biotypes on cotton, among host plants for biotype B and among the whitefly speciesB. tabaciandTrialeurodes vaporariorum(Westwood), the greenhouse whitefly. The biotype identification of different populations ofB. tabaciwas summarized in a table. Biotypes discussed were A, B, Indian and biotypes of the Old World group. Temperature dependent relationships were estimated for egg development rate, development rate from egg to adult, immature mortality, adult longevity, sex-ratio, pre-oviposition period and fecundity. The fitted curves will be used as input for a simulation model of the population dynamics ofB. tabaciin a greenhouse when parasitoids are released. The model makes it possible to evaluate the integrated effect of different life-history parameters and behavioural parameters of parasitoids on whitefly population levels in a greenhouse.

scholarly journals 011 Reflective Mulches and Yellow Sticky Tape Control Whiteflies in Greenhouse Poinsettia (Euphorbia pulcherrima)

HortScience ◽  
1999 ◽  
Vol 34 (3) ◽  
pp. 442E-442
Author(s):  
Robert P. Rice ◽  
Shelly Baird ◽  
Linzy Gatlin
Keyword(s):  
Insect Pests ◽  
Trialeurodes Vaporariorum ◽  
Euphorbia Pulcherrima ◽  
Silverleaf Whitefly ◽  
Bemisia Argentifolii ◽  
Greenhouse Whitefly ◽  
Subsequent Trial ◽  
Sticky Tape ◽  
Polyethylene Mulch ◽  
Better Than

Greenhouse Whitefly (Trialeurodes vaporariorum) and Silverleaf Whitefly (Bemisia argentifolii) are the most serious insect pests of poinsettia. Most growers rely on the use of foliar insecticide applications before bract coloring and an application of a single soil application of imidicloprid (Marathon) subsequently. This research was undertaken to investigate the use of reflective mulches or bench covers, which have been shown to be effective in outdoor applications for control of whitefly in the greenhouse. In an early trial, silver painted pot spacers and silver polyethylene mulch were placed between pots and both nymphs on leaves and adults caught on yellow sticky cards were monitored. Nymph populations were reduced by ≈35% and adults caught on sticky cards increased by ≈40% when compared with the control. In a subsequent trial, reflective bench covers were combined with the use of yellow sticky tape placed above the canopy of the crop and compared with sticky tape alone, reflective mulch alone, and no treatment. The combination of sticky tape and reflective mulch significantly reduced whitefly populations after 6 weeks and performed better than either of the other treatments alone.

Evaluation of Selected Soybean Genotypes for Resistance to Two Whitefly Species (Homoptera: Aleyrodidae) in the Greenhouse

1995 ◽  
Vol 30 (4) ◽  
pp. 519-526 ◽  
Author(s):  
A. L. Lambert ◽  
R. M. McPherson ◽  
B. Sparks
Keyword(s):  
Growth Stage ◽  
Trialeurodes Vaporariorum ◽  
Leaf Damage ◽  
Silverleaf Whitefly ◽  
Bemisia Argentifolii ◽  
Greenhouse Whitefly ◽  
Breeding Lines ◽  
Varietal Response ◽  
Soybean Genotypes ◽  
Plant Injury

Fourteen soybean cultivars and breeding lines in Maturity Groups VII and VIII were monitored for silverleaf whitefly, Bemisia argentifolii Bellows and Perring, and greenhouse whitefly, Trialeurodes vaporariorum (Westwood), infestation levels in the greenhouse. Unifoliate leaves became infested with whitefly immatures and eggs 4 wks after planting. LA88-32 and F90-700 had significantly higher total whitefly populations than 11 and eight of the other entries, respectively, at growth stage V7. Whitefly populations were higher 6 wks after planting (growth stage V8–V9) when a unifoliate leaf and trifoliate leaves 1, 2, and 3 were sampled. G89-5180, Perrin, F90-988, G89-5066, N89-1, and N88-91 had significantly lower total numbers of whiteflies than F90-724, F90-700, and LA88-32. At 10 wks after planting (growth stage R2), G89-5180 and N88-91 had the lowest numbers of whiteflies, and total counts were significantly higher for F90-724 on trifoliolates 2, 4, and 6. Leaf damage ratings (% leaf burn) ranged from 1.3% (F90-724) to 74.0% (F90-1054). Sampling ceased after 10 wks because of excessive whitefly-induced plant injury to most soybean entries. This study reflected significant differences in soybean varietal response to whitefly population densities and demonstrated that the greenhouse can be used effectively to screen soybeans for resistance to whiteflies.

scholarly journals Responses of Whitefly and Poinsettias to Insecticidal Controlled Atmospheres

2000 ◽  
Vol 125 (4) ◽  
pp. 513-517 ◽  
Author(s):  
Susan S. Han ◽  
Jennifer Konieczny
Keyword(s):  
Treatment Time ◽  
Treatment Temperature ◽  
Mortality Data ◽  
Euphorbia Pulcherrima ◽  
Silverleaf Whitefly ◽  
Bemisia Argentifolii ◽  
Complete Elimination ◽  
Greenhouse Whitefly ◽  
Controlled Atmospheres ◽  
Time Required

Eggs, larvae, pupae, and adult stages of greenhouse whitefly (Trialeurodes vaporarium Westwood) and silverleaf whitefly (Bemisia argentifolii Bellows & Perring) were exposed to insecticidal controlled atmospheres at 20 °C or 30 °C. Mortality data were calculated for each stage and results demonstrated that reduced-O2 atmospheres (an O2 level of <2 μL·L-1 balance in N2) resulted in faster and higher mortality than elevated-CO2 atmospheres (25% or 50% CO2). Responses, from the least to most tolerant stage was adult < larvae < eggs = pupae, regardless of the species of whitefly and treatment temperature. At 20 °C, treatment time required to kill >90% of adults, larvae, and eggs and pupae was 2, 4, and 8 hours, respectively. Increasing the treatment temperature from 20 to 30 °C reduced the treatment time to one-half that of 20 °C. Treatment time required to achieve complete elimination of the insects also caused phytotoxicity symptoms on poinsettias (Euphorbia pulcherrima Willd. ex Klotzsch), thus, limiting use of insecticidal controlled atmospheres as the sole means for managing whitefly.

Population Dynamics and Distribution of Trialeurodes vaporariorum and Bemisia tabaci (Homoptera: Aleyrodidae) on Poinsettia Following Applications of Three Chemical Insecticides

1993 ◽  
Vol 28 (1) ◽  
pp. 126-135 ◽  
Author(s):  
T. X. Liu ◽  
R. D. Oetting ◽  
G. D. Buntin
Keyword(s):  
Population Dynamics ◽  
Spatial Distribution ◽  
Bemisia Tabaci ◽  
Trialeurodes Vaporariorum ◽  
Immature Stages ◽  
Single Application ◽  
Sweetpotato Whitefly ◽  
Greenhouse Whitefly ◽  
Insecticide Application ◽  
The Third

The effects of three insecticides, bifenthrin, endosulfan and aldicarb, on the within- and between-plant distributions of both greenhouse whitefly (GHWF), Trialeurodes vaporariorum (Westwood), and sweetpotato whitefly (SPWF), Bemisia tabaci (Gennadius), were examined on greenhouse-grown poinsettia using Taylor's Power Law. Insecticide applications affected the spatial distribution of GHWF and SPWF. The populations of immatures of both species surviving an insecticide application on poinsettia were less aggregated within and between plants than untreated populations. Among the three insecticides, the efficacy against the two whiteflies was not significantly different at the end of the seventh week when multiple applications were conducted. Aldicarb caused higher mortality of immature stages than bifenthrin and endosulfan after four weeks following a single application. A single application of bifenthrin and endosulfan affected the distribution of all whitefly stages in the first and second weeks after treatment, whereas aldicarb did not affect the whitefly population until the third week. Insecticidal treatments had little effect on the stratification of whitefly stages within the plant.

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