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.

scholarly journals Twospotted Spider Mite Test, 1996

1997 ◽  
Vol 22 (1) ◽  
pp. 384-384
Author(s):  
D. R. Smitley ◽  
T. W. Davis
Keyword(s):  
Spider Mite ◽  
New Guinea ◽  
Post Treatment ◽  
Research Center ◽  
Michigan State University ◽  
Individual Plant ◽  
State University ◽  
Twospotted Spider Mite ◽  
New Guinea Impatiens ◽  
Twospotted Spider

Abstract On 22 Jul, thirty-two, 6-inch tall New Guinea Impatiens in 4 inch square plastic pots held at tht Pesticide Research Center greenhouses, Michigan State University, were sampled by counting all active mites on the undersides of 4 leaves. The plants were then blocked by these counts and sprayed on 25 Jul with an R&D CO2 sprayer with an 8008 flat fan nozzle at 50 psi to first runoff. Each treatment was replicated 4 times with each replicate being an individual plant. Post-treatment counts were made on 29 Jul, 2, 9, 20 and 28 Aug in the same mannei as the pretreatment. The plants sprayed with M-Pede followed by a Sanmite application 5 days later were treated on 25 Jul and 31 Jul.

Effect of Barren Soil Borders and Weed Border Treatments on Movement of the Twospotted Spider Mite into Peanut Fields1,2,3

1984 ◽  
Vol 11 (1) ◽  
pp. 52-55 ◽  
Author(s):  
L. S. Boykin ◽  
W. V. Campbell ◽  
L. A. Nelson
Keyword(s):  
Spider Mite ◽  
Field Tests ◽  
Spider Mites ◽  
Twospotted Spider Mite ◽  
Field Cage ◽  
Arachis Hypogaea L ◽  
Barren Soil ◽  
Tetranychus Urticae Koch ◽  
Over Time ◽  
Twospotted Spider

Abstract Barren soil borders, weed border treatments, and caged barren soil were evaluated for their effect on movement of the twospotted spider mite, Tetranychus urticae Koch, into peanut (Arachis hypogaea L.) fields. In field cage tests when a 3, 4.5, or 6 m strip of barren soil separated a source of mite-infestation from initially mite-free peanut, mite damage to peanut was inversely related to the distance of barren soil crossed. In uncaged field tests, similar barren soil borders did not prevent mite movement into peanut fields, however, the number of mites were inversely related to the distance from the field border. There were no significant differences among weed border treatments and total numbers of mites entering peanut fields over time. There were, however, differences among weed border treatments on early mite movement and establishment trends into peanut fields. Mowing weed borders significantly increased the number of aerially dispersing twospotted spider mites within the adjacent peanut field.

scholarly journals Effect of Fungicides and Miticides with Mitochondria Electron Transport Inhibiting Activity on the Twospotted Spider Mite, Tetranychus urticae (Acari: Tetranychidae)

HortScience ◽  
2010 ◽  
Vol 45 (4) ◽  
pp. 687-689 ◽  
Author(s):  
Raymond A. Cloyd ◽  
Cindy L. Galle ◽  
Stephen R. Keith ◽  
Kenneth E. Kemp
Keyword(s):  
Electron Transport ◽  
Tetranychus Urticae ◽  
Spider Mite ◽  
Adult Life ◽  
Spider Mites ◽  
Twospotted Spider Mite ◽  
Negative Effects ◽  
Percentage Mortality ◽  
Horticultural Crops ◽  
Twospotted Spider

The twospotted spider mite, Tetranychus urticae, is a major arthropod pest of many greenhouse-grown horticultural crops. Greenhouse producers use a variety of miticides to suppress twospotted spider mite populations. A group of miticides known as mitochondria electron transport inhibitors or METIs include acequinocyl, fenpyroximate, and pyridaben. In addition, there are strobilurin-based fungicides such as azoxystrobin, kresoxim-methyl, and trifloxystrobin that are also known as METIs. We conducted a study to determine if these METI fungicides had any miticidal properties against the nymph and adult stages of the twospotted spider mite. The designated treatments were applied to marigold (Tagetes erecta) plants naturally infested with twospotted spider mites. Assessments of live and dead twospotted spider mite nymphs and adults were conducted 3, 7, and 14 days after applying the treatments. None of the METI fungicides had any activity against the nymph and adult life stages of the twospotted spider mite, with percentage mortality values <18%. The METI miticides appeared to be more effective against twospotted spider mite nymphs than the adults based on percentage mortality values across the three evaluation periods (35.2% to 100% for nymphs and 11.4% to 87.9% for adults). This study demonstrated that the strobilurin-based fungicides have negligible negative effects on twospotted spider mites.

scholarly journals Greenhouse Conditioning Affects Landscape Performance of Bedding Plants

1998 ◽  
Vol 16 (3) ◽  
pp. 138-142
Author(s):  
Joyce G. Latimer ◽  
Ronald D. Oetting
Keyword(s):  
Plant Height ◽  
Treatment Plant ◽  
New Guinea ◽  
Water Soluble ◽  
Plant Performance ◽  
Greenhouse Production ◽  
Bedding Plants ◽  
Landscape Plant ◽  
Quality Ratings ◽  
New Guinea Impatiens

Abstract Conditioning treatments were evaluated for effects on growth of bedding plants during greenhouse production and carryover effects on plant performance in the landscape. Treatments included two fertilization regimes using a complete water soluble fertilizer applied three times/week at 500 ppm N, designated ‘high N’, or at 50 ppm N, designated the ‘low N’ treatment. Other treatments included: ebb and flow irrigation, drought stress for up to 2 h wilt/day, 5000 ppm B-Nine (daminozide), 45 ppm Bonzi (paclobutrazol; 180 ppm on columbine), and brushing (40 strokes twice daily). Unless otherwise noted all plants, including controls, were maintained well-irrigated and fertilized with 250 ppm N three times/week. Marigolds and New Guinea impatiens grown under low N during greenhouse production exhibited reduced plant height and width relative to control plants at 4 weeks after planting (WAP) in the landscape. Plant quality ratings of all species conditioned with low N were lower than those of controls 2 and 4 WAP. Plant height of New Guinea impatiens conditioned with high N was greater than that of controls 4 WAP in the landscape. Marigolds subjected to drought in the greenhouse were still shorter than controls 2 and 4 WAP. Persistent height reductions in the landscape in response to B-Nine were observed in ageratum 2 and 4 WAP and to Bonzi in New Guinea impatiens through 8 WAP. Brushing reduced the height of all species except ageratum in the greenhouse, but had no carryover effect on plant growth in the landscape. At 4 weeks after treatment, plant height of columbine treated with low or high N, drought, brushing, or B-Nine was reduced relative to controls, but all plants were similar in size in the landscape.

scholarly journals THE EFFECTS OF GROWTH REGULATORS ON FLOWERING, BRANCHING PATTERNS AND GROWTH OF NEW GUINEA IMPATIENS

HortScience ◽  
1990 ◽  
Vol 25 (9) ◽  
pp. 1099c-1099
Author(s):  
J. Phillip McKnight ◽  
G. L. Klingaman
Keyword(s):  
Plant Growth ◽  
Flower Development ◽  
No Reduction ◽  
New Guinea ◽  
Bedding Plants ◽  
Control Growth ◽  
Branching Patterns ◽  
New Guinea Impatiens ◽  
Number Of Branches ◽  
Growth Regulator Treatment

Eighteen New Guinea impatiens cultivars were evaluated for performance as bedding plants and for suitability as hanging basket plants. The cultivars were treated with three growth retarding chemicals (B-9, Sumagic and Cutless) to determine their effect on plant growth, branching and overall flower development. Two applications of 2500 ppm B-9 produced the most commercially acceptable plants. Height and spread were reduced by approximately 30 percent with no reduction in the number of flowers produced or the number of days to bloom. Cutless and Sumagic applications reduced growth approximately 50 percent and delayed blooming as much as 2 weeks when compared to the untreated control. Growth regulator treatment had no effect on the number of branches produced except with Sumagic which resulted in an overall reduction in branching.

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