Population Dynamics and Within-Plant Distribution of the Western Flower Thrips (Thysanoptera: Thripidae) an Early-Season Predator of Spider Mites Infesting Cotton

1988 ◽  
Vol 17 (3) ◽  
pp. 551-559 ◽  
Author(s):  
C. H. Pickett ◽  
L. T. Wilson ◽  
D. González
Keyword(s):  
Population Dynamics ◽  
Western Flower Thrips ◽  
Spider Mites ◽  
Plant Distribution ◽  
Early Season ◽  
Flower Thrips

Temporal Analysis of Western Flower Thrips (Thysanoptera: Thripidae) Population Dynamics on Reunion Island

1998 ◽  
Vol 27 (6) ◽  
pp. 1437-1443 ◽  
Author(s):  
Nathalie Boissot ◽  
Bernard Reynaud ◽  
Philippe Letourmy
Keyword(s):  
Population Dynamics ◽  
Western Flower Thrips ◽  
Temporal Analysis ◽  
Reunion Island ◽  
Flower Thrips ◽  
Réunion Island

Naturally-Occurring Biological Control: Western Flower Thrips Impact on Spider Mites in California Cotton

1995 ◽  
pp. 317-323 ◽  
Author(s):  
Daniel González ◽  
Rex Friesen ◽  
Thomas F. Leigh ◽  
T. Wilson ◽  
M. Waggoner
Keyword(s):  
Biological Control ◽  
Western Flower Thrips ◽  
Spider Mites ◽  
Flower Thrips ◽  
Naturally Occurring

scholarly journals Frankliniella Occidentalis (Thysanoptera: Thripidae) Population Dynamics on

2012 ◽  
Vol 69 (1) ◽  
Author(s):  
Ion OLTEAN ◽  
Anca Dafina COVACI ◽  
Teodora FLORIAN ◽  
Cristina MATEI
Keyword(s):  
Population Dynamics ◽  
Sex Ratio ◽  
Tomato Spotted Wilt Virus ◽  
Frankliniella Occidentalis ◽  
Western Flower Thrips ◽  
Flower Thrips ◽  
Tomato Spotted Wilt ◽  
The One ◽  
Wilt Virus ◽  
Treatment Application

Western flower thrips, Frankliniella occidentalis (Pergande) is an important crop pest and a vector of tomato spotted wilt virus (TSWV) in many areas of the world. Its feeding can cause scarring and deformations on leaves and fruit, with seedlings and soft tissue particularly prone to feeding damage. Cucumbers and other vegetable are susceptible to fruit scarring. Population dynamics of western flower thrips was monitored both in field and protected spaces throughout different methods and on different ornamental and vegetables hosts. In this paper results regarding population dynamic on cucumber greenhouse crop are presented. Studies were conducted throughout five weeks. Shaken method was used. Ten leaves from the bottom of the plant, ten from the middle, ten from the tip of the plant and ten flowers were weekly sampled. Mean temperature and treatments applications were recorded. The fallen larvae and adults were counted. Females and males were separately noted. Sex ratio influence and spatial distribution was also followed. Data analysis demonstrated that thrips preferred to feed on younger leaves situated on tip of the plant. There was a very low difference between sex ratio in leaves as compared with the one in flowers. Regarding population dynamics of thrips on whole study period the trend was of increasing, thus treatment application were less efficient and proves its high pesticide resistance character.

scholarly journals Biocontrol in practice in Canadian floricultural greenhouses

2021 ◽  
Vol 27 (4) ◽  
pp. 544-555
Author(s):  
Poonam Singh ◽  
Tiffany Nykolyshyn
Keyword(s):  
Western Flower Thrips ◽  
Spider Mites ◽  
Biocontrol Agents ◽  
Steinernema Feltiae ◽  
Aphidius Ervi ◽  
Encarsia Formosa ◽  
Canadian Prairie ◽  
Aphidius Colemani ◽  
Amblyseius Cucumeris ◽  
Flower Thrips

Abstract The environment inside Canadian prairie greenhouses differs from greenhouses built in other northern latitude locations in terms of lighting, temperature, humidity, and photoperiod. Since the performance of biocontrol agents depends upon several interactive environmental variables, their effectiveness to control pests in a particular crop growing under certain climatic conditions does not directly translate to another crop or location. So, we analyzed research trials assessing the efficacy and compatibility of various biocontrol agents (Amblyseius cucumeris, Amblyseius cucumeris, Phytoseiulus persimilis, Encarsia formosa, Aphidius colemani, Aphidius ervi, and Steinernema feltiae) on key pests (Western flower thrips, two-spotted spider mites, greenhouse whiteflies, and aphids) of spring bedding plants grown in a commercial floricultural greenhouse. Were analyzed several compatible combinations of biocontrol agents and observed a significant reduction in pest densities and plant damage symptoms as compared to untreated control plants. The results demonstrate that P. persimilis controlled two-spotted spider mites successfully in calibrachoa crop. The combination of Amblyseius cucumeris and S. feltiae resulted in significantly better control of Western flower thrips than the use of Amblyseius cucumeris alone in sweet potato vine plants. The application of E. formosa and Amblyseius cucumeris individually reduced greenhouse whiteflies on calibrachoa plants as compared to control, but their combination performed better resulting in a significantly lower number of whiteflies on plants. Another combination of Aphidius colemani and Aphidius ervi controlled green peach aphids and foxglove aphids effectively on the pansy crop. The biocontrol agents were effective for managing a variety of pests in a commercial greenhouse setting.

Influence of a Neonicotinoid Seed Treatment on a Nontarget Herbivore of Soybean (Twospotted Spider Mite) and Diet Switching by a Co-occurring Omnivore (Western Flower Thrips)

2020 ◽  
Vol 49 (2) ◽  
pp. 461-472
Author(s):  
Robert Brenner ◽  
Deirdre A Prischmann-Voldseth
Keyword(s):  
Pest Management ◽  
Seed Treatment ◽  
Spider Mite ◽  
Leaf Tissue ◽  
Western Flower Thrips ◽  
Spider Mites ◽  
Leaf Discs ◽  
Flower Thrips ◽  
Soybean Leaf ◽  
Mite Eggs

Abstract Insecticidal neonicotinoid seed treatments are a common agricultural insect pest management strategy; however, effects on nontarget pests and omnivorous arthropods are understudied. We used a series of experiments to evaluate impacts of the neonicotinoid seed treatment thiamethoxam on densities of herbivorous twospotted spider mites (Tetranychus urticae Koch [Acari: Tetranychidae]) and feeding behavior of western flower thrips (Frankliniella occidentalis Pergande [Thysanoptera: Thripidae]), an omnivore that feeds on spider mite eggs but is also a significant plant pest. Spider mite densities were higher on neonicotinoid-treated soybeans, but only when mites were not spatially confined. We then examined how availability of thiamethoxam-treated food items (i.e., eggs from spider mites reared on treated soybeans, soybean leaf discs, or a combination of the two), and previous exposure to thiamethoxam-treated soybean impacted thrips feeding. Regardless of the presence of leaf tissue, thrips consumed fewer spider mite eggs laid by females reared on treated soybeans, suggesting spider mite eggs can serve as poisoned prey. Overall, thrips consumed less treated soybean leaf tissue, and thrips on treated leaf discs had a lower percentage of herbivorous feeding events and consumed more nontreated spider mite eggs, indicating a dietary shift from herbivory to predation. The neonicotinoid status of spider mite eggs and prior exposure of thrips also caused shifts in the number and size of leaf scars, likely as a result of altered foraging behavior and/or movement. Shifts between herbivory and predation have implications for thrips damage, virus transmission, and pest management, especially in systems with mixtures of nontreated and neonicotinoid-treated plants.

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