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.

Gamma-Ray Irradiation Control of Whiteflies Bemisia tabaci (Hemiptera: Aleyrodidae) and Trialeurodes vaporariorum in the Exportation of Fresh Strawberries

2019 ◽  
Vol 112 (4) ◽  
pp. 1611-1617 ◽  
Author(s):  
Sun-Ran Cho ◽  
Hyun-Na Koo ◽  
Soeun Shin ◽  
Hyun Kyung Kim ◽  
Jong-Heum Park ◽  
...  
Keyword(s):  
Bemisia Tabaci ◽  
Gamma Rays ◽  
Gamma Ray ◽  
Trialeurodes Vaporariorum ◽  
Export Market ◽  
Annual Growth ◽  
Sweetpotato Whitefly ◽  
Greenhouse Whitefly ◽  
Reproductive Sterility ◽  
Gamma Ray Irradiation

Abstract Whitefly pests, including the sweetpotato whitefly, Bemisia tabaci (Gennadius), and the greenhouse whitefly, Trialeurodes vaporariorum (Westwood), are economically important in agriculture. With the annual growth of the domestic fresh fruit export market, various quarantine treatment methods are being used to export strawberries of better quality. The objective of the present study was to evaluate the effects of gamma rays on the development and reproductive sterility of B. tabaci and T. vaporariorum. In both species, the eggs were completely inhibited from hatching at 50 Gy, and the emergence of third-instar nymphs was completely suppressed at 150 Gy. Some adult B. tabaci and T. vaporariorum spawning occurred at 100 and 70 Gy, respectively; however, at these irradiation levels, F1 hatchability was completely inhibited. Dosimetry results showed that the penetrating power of gamma ray in the strawberry-filled box was the lowest at the mid-box position. Therefore, B. tabaci and T. vaporariorum were placed in the middle of the strawberry-filled box and irradiated. A gamma-ray irradiation of 100 Gy suppressed the development and reproduction of eggs and adults in both B. tabaci and T. vaporariorum. Our data suggest that at least 100 Gy should be used for the control of these two species of whitefly for strawberry export.

Temperature and Diel Catches of Trialeurodes vaporariorum and Bemisia tabaci (Homoptera: Aleyrodidae) Adults on Sticky Traps in the Greenhouse

1994 ◽  
Vol 29 (2) ◽  
pp. 222-230 ◽  
Author(s):  
Tong-Xian Liu ◽  
Ronald D. Oetting ◽  
G. David Buntin
Keyword(s):  
Bemisia Tabaci ◽  
Activity Patterns ◽  
Trialeurodes Vaporariorum ◽  
Flight Activity ◽  
Euphorbia Pulcherrima ◽  
Plant Canopy ◽  
Gerbera Jamesonii ◽  
Sweetpotato Whitefly ◽  
Greenhouse Whitefly ◽  
Sticky Traps

Patterns of diel flight activity of the greenhouse whitefly, Trialeurodes vaporariorum (Westwood), and sweetpotato whitefly, Bemisia tabaci (Gennadius), were investigated on poinsettia, Euphorbia pulcherrima Willd., and gerbera daisy, Gerbera jamesonii H. Bolus, under greenhouse and environmentally controlled conditions. Adult flight activity was monitored at 2-h intervals (from 0700 to 2100 h EST) at various heights using yellow sticky traps. Traps placed 5 cm above the top of the plant canopy caught more adults of both species than traps placed higher. The daily patterns of catches of T. vaporariorum and B. tabaci adults in the greenhouse were similar and were unimodal with peak catches occurring between 0900–1300 h. Numbers of adults caught on the sticky traps in the greenhouse were correlated with temperature and relative humidity for T. vaporariorum, but not for B. tabaci. Few adults were caught during the dark hours (from 2100 to 0700 h). Under constant temperatures of 20°, 25°, and 30°C, the flight activity patterns of both whitefly species were unimodal, with peak catches of T. vaporariorum and B. tabaci occurring in the morning and afternoon, respectively. Differences in temperature did not significantly alter the pattern of catches of adults on sticky traps. The lowest temperature for initiation of whitefly flight was 16–17°C for T. vaporariorum, and 17–18°C for B. tabaci.

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').

scholarly journals Population Dynamics of Acromyrmex crassispinus (Forel) (Hymenoptera: Formicidae) and Attacks on Pinus taeda Linnaeus (Pinaceae) plantations

Sociobiology ◽  
2015 ◽  
Vol 62 (3) ◽  
pp. 340 ◽  
Author(s):  
Mariane Aparecida Nickele ◽  
Wilson Reis Filho
Keyword(s):  
Population Dynamics ◽  
Spatial Distribution ◽  
Pinus Taeda ◽  
Forest Canopy ◽  
First Year ◽  
Nest Density ◽  
Nuptial Flight ◽  
The Third ◽  
Leaf Cutting ◽  
Pinus Taeda L

This work aimed to study the population dynamics of Acromyrmex crassispinus (Forel) in Pinus taeda L. plantations, evaluating the density and spatial distribution of nests over time, inferring about the period of the first nuptial flight of A. crassispinus colonies, and evaluating the levels of attack of this leaf-cutting ant on P. taeda plants. Assessments were performed monthly in the first year after planting, every three months until the third year and every six months until the plantation was six years old. The presence of nests was observed only after 15 months after planting. The nest density gradually increased until the planting completed 30 months, and decreased when the forest canopy began to close (after 54 months). Spatial distribution of A. crassispinus nests was random. Probably, the first nuptial flight of an A. crassispinus colony occurs after the third year of the colony foundation. Pinus taeda plants were not attacked by A. crassispinus throughout the evaluation period. Then, when dealing with a replanting area of Pinus plantation, where the previous forest has not been subject to pruning nor thinning, the problem with A. crassispinus is almost null if the clearcutting and the new planting occur during the winter. In this case, leaf-cutting ants control can be alleviated and it is not necessary to carry out systematic control of ants where A. crassispinus is the predominant leaf cutting ant species. Acromyrmex crassispinus control should be done only if nests are located or if attacked plants by ants are detected.

Distribution of Trialeurodes vaporariorum and Bemisia tabaci (Homoptera: Aleyrodidae) on Some Greenhouse-grown Ornamental Plants

1993 ◽  
Vol 28 (1) ◽  
pp. 102-112 ◽  
Author(s):  
Tong-Xian Liu ◽  
Ronald D. Oetting ◽  
G. David Buntin
Keyword(s):  
Bemisia Tabaci ◽  
Developmental Stages ◽  
Ornamental Plants ◽  
Leaf Age ◽  
Trialeurodes Vaporariorum ◽  
Middle Aged ◽  
Greenhouse Whitefly ◽  
Whole Plant ◽  
Young Leaves ◽  
The Vertical Distribution

The within-plant and between-plant distributions of all stages of both greenhouse whitefly (GHWF), Trialeurodes vaporariorum (Westwood) on poinsettia, chrysanthemum and gerbera daisy, and sweetpotato whitefly (SPWF), Bemisia tabaci (Gennadius) on poinsettia, were examined using Taylor's power law (s2 = amb) and Iwao's patchiness () methods. We found that all developmental stages of the two whitefly species on all plants examined were aggregated within and between plants. The vertical distribution of whitefly stages is stratified among leaves within the plant with respect to leaf age rather than relative height of the leaves on the plants. Most of the adults, eggs and the first-instar nymphs occurred on young leaves. The second- and third-instar nymphs occurred on middle-aged leaves, and most of the pupae and empty pupal cases occurred on middle-aged and older leaves. Comparison of whitefly counts from the different combinations of top, middle, and bottom leaves with the whole-plant counts on poinsettia was correlated and these leaves can be sampled as an indication of population levels within a greenhouse population.

SWEETPOTATO WHITEFLY BEMISIA TABACI (GENNADIUS) (HOMOPTERA: ALEYRODIDAE), A POTENTIAL INSECT PEST IN CANADA

1989 ◽  
Vol 121 (11) ◽  
pp. 1027-1028 ◽  
Author(s):  
A.B. Broadbent ◽  
R.G. Foottit ◽  
G.D. Murphy
Keyword(s):  
United States ◽  
Population Dynamics ◽  
Plant Species ◽  
Bemisia Tabaci ◽  
Insect Pest ◽  
The United States ◽  
Euphorbia Pulcherrima ◽  
Sweetpotato Whitefly

The sweetpotato whitefly, Bemisia tabaci (Gennadius), was accidentally imported into Canada on poinsettia, Euphorbia pulcherrima Willd., cuttings from the United States in 1987 and in 1988. The biology and population dynamics of B. tabaci were reviewed by Butler et al. (1986). It is a worldwide pest of more than 500 plant species in 74 families. Prior to 1986, there was only one report of this insect as a greenhouse pest, on vegetables in Turkey (Lopez-Avila and Cock 1986). Bemisia tabaci was first reported on poinsettia in Florida greenhouses in November 1986 (Price et al. 1987). In 1987, this insect was reported as a pest on field tomatoes in Florida (Schuster and Price 1987).

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