scholarly journals Onion Thrips Control, Trial 1 1996

1997 ◽  
Vol 22 (1) ◽  
pp. 141-141
Author(s):  
Whitney Cranshaw ◽  
D. Casey Sclar ◽  
D. Gerace ◽  
A. Tupy
Keyword(s):  
Block Design ◽  
Compressed Air ◽  
Onion Thrips ◽  
Randomized Complete Block Design ◽  
Neck Area

Abstract Trials were conducted in Ft. Collins, CO, using transplanted onions (cv. Vega) in single rows at 30-in spacing. Plots were 25-ft in length arranged in a randomized complete block design with 4 replications. Treatments were applied using a CO2 compressed air sprayer delivering 18.4 gpa at 40 psi in two passes directed along the sides of the planting. An organosilicant spreader (Kinetic, 6 fl oz/acre) was added to all treatments except the garlic solution (Guardian). Application dates varied among treatments. Evaluations were made by examining 10 plants per plot and counting all thrips present in the neck area of the onions.

scholarly journals Onion Thrips Control, 1996

1997 ◽  
Vol 22 (1) ◽  
pp. 140-140
Author(s):  
Whitney Cranshaw ◽  
Janson Bishop
Keyword(s):  
Block Design ◽  
Compressed Air ◽  
Onion Thrips ◽  
Randomized Complete Block Design ◽  
Neck Area

Abstract Trials conducted in Fruita, CO, using seeded onions (cv. Brown Beauty) in single rows at 30-in spacing Plots were 20-ft in length arranged in a randomized complete block design with 4 replications. Treatments were applied 20 Jun and 11 Jul using a CO compressed air sprayer delivering 19.2 gpa at 40 psi in two passes directed along the sides of the planting. Evaluations were made by examining 10 plants per plot and counting all thrips present in the neck area of the onions.

scholarly journals Colorado Potato Beetle Control on Potatoes with In-Furrow Treatments, 1994

1995 ◽  
Vol 20 (1) ◽  
pp. 115-115
Author(s):  
James J. Linduska ◽  
Marylee Ross ◽  
Karen Mulford ◽  
John Nottingham
Keyword(s):  
Colorado Potato Beetle ◽  
Rating Scale ◽  
Block Design ◽  
Compressed Air ◽  
Single Treatment ◽  
Egg Masses ◽  
Row Crop ◽  
Potato Beetle ◽  
Randomized Complete Block Design ◽  
Direct Counts

Abstract ‘Kennebec’ potatoes were planted in 20 foot rows on 25 Apr, ‘94. Plots consisted of a single treatment row. The distance between rows was 64 inches and the distance between plants within the row was 10 inches. Plots were arranged in a randomized complete block design with 4 replications. The soil was a Norfolk "A" loamy sand. Initial furrow treatments were applied to the seed at the rate of 20 gal per acre with a small watering can. Admire foliar treatments were applied at a rate of 50 gal per acre on 8, 23 and 29 Jun with a custom built compressed air row crop sprayer with each row being covered by 6 drop nozzles delivering 50 gal/acre at 30 psi. In evaluating the treatments, direct counts of the number of Colorado potato beetle adults, larvae and egg masses/10 plants and the % defoliation were recorded. Defoliation categories were assigned using a pretransformed defoliation rating scale, based on dividing 90° into 13 steps corresponding to arcsin transformation values (Little & Hills 1978). Yields were taken on 20 Jul from 20-ft of row.

scholarly journals Evaluation of Selected Bacillus Thuringiensis Insecticides for Control of Soybean Looper in North Louisiana, 1994

1995 ◽  
Vol 20 (1) ◽  
pp. 238-238 ◽  
Author(s):  
Rosanne N. Mascarenhas ◽  
Alan T. Wier ◽  
David J. Boethel ◽  
P. Scott Lingren ◽  
B. Rogers Leonard
Keyword(s):  
Block Design ◽  
Experimental Period ◽  
Compressed Air ◽  
Row Spacing ◽  
Research Station ◽  
Hollow Cone ◽  
Randomized Complete Block Design ◽  
Period Data ◽  
Soybean Looper ◽  
North Louisiana

Abstract A field study was conducted at the Macon Ridge Branch, Northeast Research Station, located near Winnsboro (Franklin Parish), Louisiana, to evaluate the efficacy of several B. thuringiensis insecticides for soybean looper control. Test plots were 50 ft long by 5 rows with a 40 inch row spacing and were arranged in a randomized complete block design with four replications. Insecticides were applied with a tractor and compressed air sprayer calibrated to deliver 10 gpa at 38 psi through TX8 hollow cone nozzles (2 per row). Insecticide treatments were applied to soybeans in the R5 stage of growth (beginning seed) on 25 Aug. Posttreatment counts, consisting of 25 sweeps per plot, were taken with a 15 inch diameter muslin net at 2, 5, and 7 DAT. No rainfall occurred and the plots were not irrigated during the experimental period. Data were analyzed using analysis of variance followed by means separation according to DMRT.

scholarly journals Control of Cypermethrin Treatment-History Thrips in Onions, FT. Morgan, Co, 1994

1995 ◽  
Vol 20 (1) ◽  
pp. 98-98
Author(s):  
Whitney S. Cranshaw
Keyword(s):  
Block Design ◽  
Compressed Air ◽  
Treatment History ◽  
Whole Plant ◽  
Randomized Complete Block Design

Abstract Plots were established 10 Jun at a production field of transplanted onions south of Ft. Morgan, CO. The field had previously been treated with cypermethrin (Ammo 2.5E), but thrips populations remained in excess of 30/plant one week after applications. Plots consisted of single two-row beds, 50-ft in length arranged in a randomized complete block design with four replications. Treatments were applied with a hand-operated compressed air sprayer delivering 50 gal/acre. Evaluations were made 14 Jun, using whole plant counts on six consecutive plants in the center of each plot.

scholarly journals Effect of Growth Retardants on Production of Containerized `Barbara Karst' Bougainvillea

HortScience ◽  
1996 ◽  
Vol 31 (4) ◽  
pp. 679b-679
Author(s):  
James H. Aldrich ◽  
Jeffrey G. Norcini
Keyword(s):  
Growth Habit ◽  
Maleic Hydrazide ◽  
Block Design ◽  
Foliar Spray ◽  
Compressed Air ◽  
Growth Retardants ◽  
Bacterial Spot ◽  
Randomized Complete Block Design ◽  
Soilless Substrate ◽  
Bougainvillea Glabra

The effect of four PGRs on production of `Barbara Karst' bougainvillea [Bougainvillea × buttiana (Bougainvillea glabra Choicy × Bougainvillea peruviana Humb. & Bonpl.) was determined. Liners were transplanted into 3.8-L containers with a soilless substrate on 6 Apr. 1995 and were pruned on 15 May (mean height and width 23.6 and 34.5 cm, respectively). Uniconazole (10 ppm), maleic hydrazide (2808 ppm), daminozide (5000 ppm), and paclobutrazol (50, 100, or 200 ppm) were applied as a foliar spray (to wet) by a compressed air backpack sprayer on 16 May (0 weeks after treatment [WAT]). Daminozide (5000 ppm) was reapplied 31 May and 13 June as described above. Soil drenches of 5, 10, or 20 ppm paclobutrazol were additional treatments. Two nonPGR-treated controls were included: pruned at 0 WAT, and pruned at 0 and 4 WAT. There were eight replications per treatment placed in a randomized complete block design on a container bed under full sun and drip irrigation. At 6, 9, and 12 WAT, growth, flowering, growth habit, number of structural branches (>15 cm long), and level of bacterial spot infection by Pseudomonas andropogonis were recorded. Marketability was recorded 12 WAT and phytotoxicity noted 1, 4, 5, 6, 9, and 12 WAT. No PGR treatment effectively suppressed growth, or enhanced quality or marketability of `Barbara Karst' bougainvillea grown in 3.8-L containers. Furthermore, daminozide reduced the number of structural branches and maleic hydrazide was phytotoxic.

scholarly journals Flea Beetle Control in Broccoli, 1996

1997 ◽  
Vol 22 (1) ◽  
pp. 86-86
Author(s):  
Mohammed Al-Doghairi ◽  
Whitney Cranshaw ◽  
D. Casey Sclar ◽  
Dan Gerace ◽  
Andrea Tupy
Keyword(s):  
Block Design ◽  
Flea Beetle ◽  
Field Research ◽  
Compressed Air ◽  
Research Center ◽  
Row Spacing ◽  
Flea Beetles ◽  
Randomized Complete Block Design ◽  
Visual Observations

Abstract Trials were conducted on spring-transplanted (13 May) broccoli (cv. Green Comet) at the Horticulture Field Research Center in Ft. Collins, CO. Individual plots consisted 20 ft long single rows with 15-in in-row spacing, arranged in a randomized complete block design with four replications. Insecticide applications were made 3 Jun and 21 Jun using a CO2 compressed air sprayer delivering 15 gpa at 30 psi in two passes directed along the sides of the planting. An organosilicant spreader (Kinetic, 6 fl oz/A) was added to all treatments. Evaluations were made by visual observations of flea beetles on six plants/plot.

scholarly journals Onion Thrips Control, 1992

1994 ◽  
Vol 19 (1) ◽  
pp. 103-103
Author(s):  
M. Davis ◽  
E. Grafius ◽  
M. Bommarito ◽  
M. Tindall ◽  
B. Ferrari ◽  
...  
Keyword(s):  
Block Design ◽  
Onion Thrips ◽  
Randomized Complete Block Design ◽  
Direct Seeded ◽  
A Site ◽  
Flat Fan Nozzle

Abstract Onions were direct seeded on 1 May at a site in Ingham County, MI. Plots were 20 ft long double rows with 16 inch spacing between double rows. Treatments were arranged in a randomized complete block design (four replications per treatment) with one unsprayed buffer row between each treatment row. Foliar treatments were applied with a hand-held CO2 sprayer with a single flat fan nozzle (TEEJET 8002VS) at 45 psi and 60 gal/acre. The NTN sidedress treatment was applied 9 Jul in a 1 inch furrow, 3 inches from the base of the plants, then covered with soil. The NTN foliar and the NTN foliar plus spreader treatments were first applied on 24 Jul; all foliar treatments (including NTN) were applied on 4, 11, and 18 Aug. Plots untreated as of 4 Aug (i.e. all but the NTN treatments) were sampled for thrips. Ten consecutive plants/replication were randomly selected and the thrips rinsed off the plants with approximately 250 ml of 75% ethanol. Thrips were filtered out of the ethanol and counted. On 6 and 20 Aug all treatments were sampled for thrips as described above.

scholarly journals Evaluation of Selected Insecticides for Control of Onion Thrips on Onions, 1994

1996 ◽  
Vol 21 (1) ◽  
pp. 130-130
Author(s):  
Alton N. Sparks ◽  
David G. Riley
Keyword(s):  
Block Design ◽  
Hollow Cone ◽  
Onion Thrips ◽  
Whole Plant ◽  
Randomized Complete Block Design ◽  
Small Plot ◽  
Spray Volume ◽  
Extension Center ◽  
Plant Inspection ◽  
Experimental Plots

Abstract A small plot efficacy study was conducted at the Texas A & M Research and Extension Center in Weslaco, Texas, to evaluate selected insecticides and the effect of spray volume on control of onion thrips on onions. Experimental plots measured 3 beds (40 inch beds) by 25 feet, with two rows of onions per bed. Treatments were arranged in a randomized complete block design with four replications. Treatments were applied on March 4, 11 and 18, with a CO2 pressurized sprayer (40 psi) with 3 10X hollow cone nozzles per bed (1 over-top, 2 on drops). Spray volume was adjusted by boom speed. Thrips were sampled by whole plant inspection of five randomly selected plants per plot. All thrips (adults and nymphs) were counted.

DISTRIBUSI DAN IDENTIFIKASI POPULASI SINTRONG (Crossocephalum crepidiodes.Benth) RESISTEN PARAKUAT PADA LAHAN JAGUNG (Zea mays) DI KABUPATEN DAIRI

2017 ◽  
Vol 4 (2) ◽  
pp. 149-161
Author(s):  
Berton Sianturi
Keyword(s):  
Zea Mays ◽  
Dose Response ◽  
High Resistance ◽  
Block Design ◽  
Recommended Dose ◽  
Second Step ◽  
Resistance Level ◽  
Susceptible Population ◽  
Randomized Complete Block Design ◽  
Susceptible Populations

Crassocephalum crepidioides on Cornfields in Dairi Regency had been reported tobecome more difficult to control using paraquat. The objective of the research was todetermine the characteristics and the distribution of C.crepidioides resistant to paraquatin cornfields. The experiment was carried out in two steps, the first step was screeningthe population of C. crepidioides with paraquat at the recommended dose, and the secondstep, dose-response experiment for the resistance level of C. crepidioides population withdose 0, 76, 152, 304,5, 609, 1218, and 2436 g.ai /ha. In the first step experiment, paraquatdichloride was applied at 280 g.ai/ha. The treatments were arranged in a randomized blockdesign with 3 replication. The second step experiment was that the resistant populationsconfirmed in the first experiment were sprayed for their dose-response. The treatmentswere arranged in a randomized complete block design (CRBD). The results showed thatof 30 populations of C. crepidiodes, 19 populations (63.3%) were categorized to beresistant with the mortality ranging from 10.84% to 52.08%, and 11 populations (36.7%),was categorized as high resistance with mortality of 0% to 9.21%. The level ofresistance (R/S) of R-C25, R-C27, and R-C30 populations of C. crepidioides were 12,3,14,86, and 24,83 times consecutively, compared with the susceptible population. Thenumber of C. crepidioides chlorophyl leaves in susceptible populations was significantlylower than that of a resistant populations.

Response of corn (Zea mays L.) to various organic-based fertilizers in marginal upland of Sta. Rita, Samar

2017 ◽  
pp. 31-43
Author(s):  
Berta Ratilla ◽  
Loreme Cagande ◽  
Othello Capuno
Keyword(s):  
Block Design ◽  
Management Strategies ◽  
Chemical Properties ◽  
Organic Fertilizers ◽  
Growth And Yield ◽  
Physical And Chemical Properties ◽  
Total N ◽  
Randomized Complete Block Design ◽  
Physical And Chemical ◽  
And Chemical Properties

Organic farming is one of the management strategies that improve productivity of marginal uplands. The study aimed to: (1) evaluate effects of various organic-based fertilizers on the growth and yield of corn; (2) determine the appropriate combination for optimum yield; and (3) assess changes on the soil physical and chemical properties. Experiment was laid out in Randomized Complete Block Design, with 3 replications and 7 treatments, namely; T0=(0-0-0); T1=1t ha-1 Evans + 45-30-30kg N, P2O5, K2O ha-1; T2=t ha-1 Wellgrow + 45-30-30kg N, P2O5, K2O ha-1; T3=15t ha-1 chicken dung; T4=10t ha-1 chicken dung + 45-30-30kg N, P2O5, K2O ha-1; T5=15t ha-1 Vermicast; and T6=10t ha-1 Vermicast + 45-30-30kg N, P2O5, K2O ha-1. Application of organic-based fertilizers with or without inorganic fertilizers promoted growth of corn than the control. But due to high infestation of corn silk beetle(Monolepta bifasciata Horns), its grain yield was greatly affected. In the second cropping, except for Evans, any of these fertilizers applied alone or combined with 45-30-30kg N, P2O5, K2O ha-1 appeared appropriate in increasing corn earyield. Soil physical and chemical properties changed with addition of organic fertilizers. While bulk density decreased irrespective of treatments, pH, total N, available P and exchangeable K generally increased more with chicken dung application.

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