Comparing Chemical and Biological Control Strategies for Twospotted Spider Mites (Acari: Tetranychidae) in Commercial Greenhouse Production of Bedding Plants

2009 ◽  
Vol 102 (1) ◽  
pp. 336-346 ◽  
Author(s):  
George P. Opit ◽  
Jamis Perret ◽  
Kiffnie Holt ◽  
James R. Nechols ◽  
David C. Margolies ◽  
...  
Keyword(s):  
Biological Control ◽  
Control Strategies ◽  
Spider Mites ◽  
Greenhouse Production ◽  
Bedding Plants ◽  
Twospotted Spider

scholarly journals Comparing Chemical and Biological Control Strategies for Twospotted Spider Mites in Mixed Production of Ivy Geranium and Impatiens

2007 ◽  
Vol 17 (3) ◽  
pp. 322-327 ◽  
Author(s):  
Kiffnie M. Holt ◽  
George Opit ◽  
James R. Nechols ◽  
David C. Margolies ◽  
Kimberly A. Williams
Keyword(s):  
Biological Control ◽  
Chemical Control ◽  
Control Strategies ◽  
Phytoseiulus Persimilis ◽  
Predatory Mites ◽  
Plant Quality ◽  
Bedding Plants ◽  
Quality Ratings ◽  
Ivy Geranium ◽  
Twospotted Spider

Biological and chemical control strategies for the twospotted spider mite (TSM; Tetranychus urticae) were evaluated in a greenhouse experiment replicated over time in mixed production of ivy geranium (Pelgargonium peltatum ‘Amethyst 96’) and two impatiens cultivars (Impatiens wallerana ‘Impulse Orange’ and ‘Cajun Carmine’). Chemical control using the miticide bifenazate was compared with two release strategies for biological control using the predatory mite, Phytoseiulus persimilis. Specific treatments included 1) a single application of bifenazate at 0.3 g·L−1 formulation (22.6% a.i.); 2) a single release of predatory mites at a 1:4 predator to pest ratio based on sampled pest density; 3) a weekly release of predatory mites at numbers based on the area covered by the crop; and 4) an untreated control. TSM populations were monitored for 4 weeks. After another 4 weeks, when plants were ready for market, plant quality ratings were recorded. The number of TSM per leaf dropped for all treatments on all genotypes but increased in the untreated plants. On ivy geranium, the fact that there were significantly more TSM on untreated plants was not reflected in average plant quality, but it did reduce the proportion of containers rated as salable at full price compared with both chemical and biological control. On impatiens, both treatment and cultivar had significant effects on the mean plant quality rating and on the proportion of containers rated as salable at full price. The use of a sampling plan to determine the appropriate number of predators to release was as effective as the currently recommended management treatments for TSM in bedding plants.

scholarly journals Stability and Resiliency of Biological Control of the Twospotted Spider Mite (Acari: Tetranychidae) in Hop

2019 ◽  
Vol 48 (4) ◽  
pp. 894-902 ◽  
Author(s):  
A E Iskra ◽  
J L Woods ◽  
D H Gent
Keyword(s):  
Biological Control ◽  
Natural Enemies ◽  
Nitrogen Fertilization ◽  
Spider Mite ◽  
Fertilization Rate ◽  
Conservation Biological Control ◽  
Spider Mites ◽  
Economic Damage ◽  
Twospotted Spider Mite ◽  
Twospotted Spider

Abstract The twospotted spider mite (Tetranychus urticae Koch) is a common pest in agricultural and ornamental crops. This pest can be controlled by resident predatory arthropods in certain situations. This research quantified the stability and resiliency of established conservation biological control of the twospotted spider mite in hop over a 5-yr period associated with nitrogen fertilization rate and use of a broad-spectrum insecticide. Biological control generally was stable and resilient over a sixfold range of nitrogen fertilization rates, and in only 1 of 5 yr did elevated nitrogen rates significantly affect populations of spider mites. In contrast, one application of the insecticide bifenthrin was associated with disruption of biological control and a severe outbreak of spider mites. The complex of natural enemies suppressed the outbreak during the same year in which bifenthrin was applied, but only after populations of spider mites exceeded levels associated with economic damage. However, in the following year the system returned to an equilibrium state where spider mites were suppressed below economically damaging levels. Therefore, conservation biological control in hop appears stable and robust to factors such as nitrogen fertilization that increase reproductive rates of spider mites but may be sensitive to factors such as nonselective insecticides that are lethal to natural enemies. Conservation biological control can be considered resilient to a single use of a nonselective insecticide in the year following the application, but not within the year of application.

scholarly journals Conditioning Treatments Affect Growth and Spider Mite Infestation of Greenhouse-grown Bedding Plants

HortScience ◽  
1995 ◽  
Vol 30 (4) ◽  
pp. 829B-829
Author(s):  
Joyce G. Latimer ◽  
Ronald D. Oetting
Keyword(s):  
Spider Mite ◽  
New Guinea ◽  
Spider Mites ◽  
Mite Infestation ◽  
Tagetes Erecta ◽  
Bedding Plants ◽  
New Guinea Impatiens ◽  
Twospotted Spider

Two weeks after planting, plugs of New Guinea impatiens (Impatiens × hybrida), marigold (Tagetes erecta), or ageratum (Ageratum Houstonianum) were subjected to eight conditioning treatments: untreated, low N (50 ppm), high N (500 ppm), ebb/flow watering, drought, brushing (40 strokes twice daily), daminozide (5000 ppm), or paclobutrazol (45 ppm). Fertilizers were applied three times per week at 250 ppm N for all plants not treated with high or low N. Five adult twospotted spider mites were placed on each plant 1 week after treatment. New Guinea impatiens height was reduced by low N, brushing, or paclobutrazol at 4 weeks after treatment. Spider mite populations were reduced only by brushing. Marigold height was reduced by low N, drought, or brushing, but spider mite counts were reduced by brushing or paclobutrazol. Height of ageratum was reduced by low N, daminozide, or paclobutrazol, but spider mite counts were reduced by ebb/flow or brushing at 4 weeks after treatment.

Reduce Disease Burden of Human Schistosomiasis in Asia Through Biological Control

2020 ◽  
Vol 20 (12) ◽  
pp. 1118-1132
Author(s):  
Sidra Saleem ◽  
Haroon Ahmed ◽  
Tooba Siddiqui ◽  
Seyma Gunyakti Kilinc ◽  
Aisha Khan ◽  
...  
Keyword(s):  
Biological Control ◽  
Geographical Distribution ◽  
Disease Burden ◽  
Management Practices ◽  
Control Strategies ◽  
Parasitic Disease ◽  
Asian Countries ◽  
Neglected Disease ◽  
Current Review ◽  
Near Future

Schistosomiasis is a chronic parasitic disease caused by a trematode blood fluke of the genus Schistosoma that belongs to the Schistosomatidae family. It is a neglected disease in different regions of Asia. In this review, 218 articles (between 2000 and 2017) related to the topic were collected from PubMed and Google scholar and reviewed. After thoroughly reading collected articles, due to irrelevant topic requirements, 94 articles were excluded. Articles that have data associated with Asian regions are considered. In Asia, the disease is prevalent in China, Philippines, Indonesia, Yemen, Nepal and Laos, etc. While in Pakistan, India and Bangladesh, the disease is not endemic and very few cases were reported. The disease was eliminated from Japan and Iran. The current review highlights the geographical distribution among Asian countries, transmission patterns, diagnosis, control strategies based on the use of anthelmintic plants and management practices implemented in Asia for the control of schistosomiasis. However, new implementations to treat schistosomiasis in humans should be proved to eliminate the disease finally in the future. This review emphasizes the biological control of schistosomiasis for the eradication of the disease from Asia in the near future.

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