scholarly journals Soil and Foliar Treatments to Control Insects in Sweet Potatoes, 1993

1994 ◽  
Vol 19 (1) ◽  
pp. 146-146
Author(s):  
John Speese
Keyword(s):  
Block Design ◽  
Light Trap ◽  
Eastern Shore ◽  
Agricultural Experiment Station ◽  
Sweet Potatoes ◽  
Foliar Sprays ◽  
Corn Rootworms ◽  
Randomized Complete Block Design ◽  
Agricultural Experiment ◽  
Trap Catches

Abstract Sweet potatoes were planted on 22 Jun at the Eastern Shore Agricultural Experiment Station, Painter, VA. Each plot consisted of 3 rows 20 ft. long with 3 ft. spacing between rows. Plots were separated by an untreated guard row and replicated 6 times in a randomized, complete block design. Mocap treatments were applied and incorporated on 10 Jun to avoid phytotoxicity. Lorsban and Temik were applied and incorporated immediately prior to planting. Mocap and Lorsban were broadcast using a 6 flat fan nozzle boom backpack sprayer delivering 20 gal water/acre. Temik was applied in a 12 inch band using a hand-held shaker. Sevin foliar sprays were started on 14 Jul, after the first clickbeetles (wireworm adults) were caught in the black light trap at Painter. Clickbeetle light trap catches were used as a basis for determining dates for the Sevin threshold sprays. The Sevin schedule sprays were applied weekly from 14 Jul through 30 Aug. The Sevin threshold sprays were applied on 14 and 27 Jul, and 9 and 30 Aug. Foliar sprays were applied in 40 gal water/acre using the same sprayer described above. On 18 Oct, the center row of each plot was harvested and 25 market-sized roots were randomly selected to determine insect damage. Damage from wireworms, southern corn rootworms (Diabrotica) and Systena flea beetles is very similar and thus recorded and analyzed as a complex (WDS damage).

scholarly journals Use of Fipronil 80Wg Foliar Sprays for Insect Control in Potatoes, Spring, 1993

1994 ◽  
Vol 19 (1) ◽  
pp. 136-136
Author(s):  
John Speese
Keyword(s):  
Block Design ◽  
Evaluation Criteria ◽  
Insect Control ◽  
Life Stages ◽  
Eastern Shore ◽  
Agricultural Experiment Station ◽  
Foliar Sprays ◽  
Randomized Complete Block Design ◽  
Compressed Gas ◽  
Agricultural Experiment

Abstract Potatoes were planted on 16 Apr at the Eastern Shore Agricultural Experiment Station, Painter, VA. Each plot consisted of four 25 ft. long rows, replicated 4 times in a randomized, complete block design. Sprays were applied beginning on 17 May through 23 Jun using a propane compressed gas back pack sprayer delivering 40 gal water/acre at 40 psi. A total of three Fipronil 80WG applications was made every two weeks, and Asana XL + PBO was applied weekly. Evaluation criteria consisted of counts of all CPB life stages present on 5 randomly chosen stems/plot 3 or 4, 7, and 14 days after each Fipronil 80WG application. Aphids and leafhoppers were sampled on 10 randomly picked leaves/plot on the dates indicated, and estimates were taken on hopper burn and defoliation. The plots were harvested and graded to determine yields.

scholarly journals Soil and Foliar Insecticides to Control Insects in Sweet Potatoes, Painter, VA, 1994

1995 ◽  
Vol 20 (1) ◽  
pp. 133-133
Author(s):  
John Speese
Keyword(s):  
Agricultural Research ◽  
Block Design ◽  
Light Trap ◽  
Corn Rootworm ◽  
Sweet Potatoes ◽  
Click Beetles ◽  
Foliar Sprays ◽  
Southern Corn Rootworm ◽  
Randomized Complete Block Design ◽  
Extension Center

Abstract Sweet potatoes were planted on 17 Jun at the Eastern Shore Agricultural Research and Extension Center, Painter, VA. Each plot consisted of 3 rows 20 ft long on 3 ft spacing, replicated six times in a randomized, complete block design. A single untreated guard row separated each plot. Soil treatments were applied immediately prior to planting in the manner indicated in the table and incorporated. Lorsban 4E and Fipronil 80WG were applied using a 6 flat fan nozzle boom backpack sprayer delivering 20 gal water/acre at 40 psi. The gallonage was increased to 40 gal/acre for the Sevin foliar sprays. The granular treatments were applied using a hand-held shaker. Application dates are indicated in the table. Foliar sprays were started when the first click beetles (wireworm adults) appeared in the black light trap at Painter, VA. The threshold sprays were terminated after the wireworm flights had stopped, and the scheduled sprays were applied weekly through 23 Aug. The center row of each plot was harvested on 12 Oct and 25 market sized roots were randomly chosen, washed, and then examined for insect damage. Damage from wireworms, Southern corn rootworm (Diabrotica) and Systena flea beetles is similar and was, therefore, counted and analyzed together as a complex (WDS damage).

scholarly journals Use of Neem-Based and Bacillus Thuringiensis Foliar Sprays to Control Colorado Potato Beetle on Potatoes, 1993

1994 ◽  
Vol 19 (1) ◽  
pp. 133-133
Author(s):  
John Speese
Keyword(s):  
Block Design ◽  
Potato Leafhopper ◽  
Plant Spacing ◽  
Eastern Shore ◽  
Agricultural Experiment Station ◽  
Hollow Cone ◽  
Potato Beetle ◽  
Randomized Complete Block Design ◽  
Compressed Gas ◽  
Agricultural Experiment

Abstract Potatoes were planted on 15 Apr at the Eastern Shore Agricultural Experiment Station, Painter, VA. Each plot consisted of a 25 ft row bordered on each side by an untreated guard row, replicated 4 times in a randomized complete block design. Plant spacing was 10 inches between plants with 36 inches between rows. Sprays to control CPB were applied on the dates indicated in the table. On 15 and 22 Jun, the Novodor treatment was sprayed with Asana XL (0.04 lb AI) due to the presence of CPB large larvae and Fl adults. From 15 Jun on, Cygon 400 (0.25 lb AI) was added to the ATI 720 treatments to control potato leafhopper (Empoasca fabae). Sprays were applied with a propane compressed gas backpack sprayer using a 3 nozzle hollow cone (D4—5) boom and delivering 60 gal water/acre at 40 psi.

scholarly journals Foliar Sprays for Insect Control in Tomatoes, 1993

1994 ◽  
Vol 19 (1) ◽  
pp. 154-154
Author(s):  
John Speese
Keyword(s):  
Block Design ◽  
Evaluation Criteria ◽  
Insect Control ◽  
Eastern Shore ◽  
Agricultural Experiment Station ◽  
Hollow Cone ◽  
Randomized Complete Block Design ◽  
Agricultural Experiment ◽  
Living Leaf ◽  
Marketable Fruit

Abstract Tomatoes were transplanted on 23 Jul at the Eastern Shore Agricultural Experiment Station, Painter, VA. Each plot consisted of a 25 ft. row, bordered on each side by an untreated guard row, and replicated 4 times in a randomized, complete block design. Spacing was 5 ft. between rows. Sprays were applied weekly beginning 20 Aug through 23 Sep using a 3 nozzle hollow cone boom backpack sprayer delivering 45 gal water/acre at 40 psi. Evaluation criteria consisted of counts of new or living leaf mines present on five marked plants/plot on the dates indicated in the table, and number of marketable fruit from the same five plants harvested on 8 and 22 Sep.

scholarly journals Head Cabbage, Microbial Control of Cutworm, Webworm, Cluster Caterpillar and Gardenlooper, 1993

1994 ◽  
Vol 19 (1) ◽  
pp. 66-66
Author(s):  
R. Muniappan ◽  
I.U. Silva-Krott
Keyword(s):  
Block Design ◽  
Microbial Control ◽  
Bare Soil ◽  
Agricultural Experiment Station ◽  
Experiment Station ◽  
Randomized Complete Block Design ◽  
Agricultural Experiment ◽  
The University ◽  
Head Cabbage ◽  
University Of Guam

Abstract The experiment was conducted at the Agricultural Experiment Station of the University of Guam, at the Inarajan site. The experiment was a randomized complete block design with four treatments and four replications. Each treatment consisted of four rows of head cabbage with eight plants on each row. Replications were separated by 60 cm of bare soil. Cabbage seedlings were planted 2 Mar 1993

Foliar Sprays to Control Insects in Wheat, Painter, Va, 1993

1995 ◽  
Vol 20 (1) ◽  
pp. 265-265
Author(s):  
John Speese III
Keyword(s):  
Agricultural Research ◽  
Flag Leaf ◽  
Block Design ◽  
Eastern Shore ◽  
Treatment Threshold ◽  
Flag Leaves ◽  
Foliar Sprays ◽  
Randomized Complete Block Design ◽  
Extension Center

Abstract Wheat was planted on 13 Nov 1993 at the Eastern Shore Agricultural Research and Extension Center, Painter, VA. Each plot was 25 ft long by 5 ft wide and replicated 4 times in a randomized, complete block design. Sprays were applied on 2 May using a 3-nozzle flat fan boom backpack sprayer delivering 20 gal water/acre at 40 psi, when CLB pressure was at or near the treatment threshold of 1 larva/flag leaf in most plots. Numbers of CLB larvae/50 flag leaves and numbers of EGA/50 ears were counted in each plot on the dates indicated in the table. Percent defoliation was rated on 12 May on 25 randomly chosen flag leaves/plot, and the plots were harvested on 7 Jul.

scholarly journals Influencia del genotipo y la temperatura sobre la carpelodia en papaya

2017 ◽  
Vol 28 (3) ◽  
pp. 577 ◽  
Author(s):  
Antonio Bogantes Arias ◽  
Eric Mora Newcomer
Keyword(s):  
Block Design ◽  
Market Value ◽  
Fruit Shape ◽  
Effect Of Temperature ◽  
Agricultural Experiment Station ◽  
Breeding Lines ◽  
Carpel Number ◽  
Randomized Complete Block Design ◽  
Agricultural Experiment ◽  
Determinant Factor

Carpellody is a phenomenon that affects hermaphrodite flowers of papaya, and consists in the transformation of the stamens into additional carpels, resulting in ovary malformation that consequently affects fruit shape and diminishes its market value. The objective of this study was to quantify the incidence of flower carpellody in papaya, and the effect of temperature on this phenomenon. An experiment was carried out between October of 2006 and January of 2007 at ”Los Diamantes” Agricultural Experiment Station, located in the province of Limón. Four breeding lines and four experimental hybrids were arranged in a randomized complete block design with four replications. The analyzed variables were the carpel number for ovaries of hermaphrodite flowers and the daily temperature during a 60-day period prior to floral anthesis of each evaluated flower. The carpel number of lines and hybrids differed significantly each week (p≤0,03). Line and hybrid averages also differed significantly during the twelve-week period (p<0,0001). The cross between a strong carpellodic line and a stable or a weak female-sterile line resulted in a hybrid that exhibited carpellody, which suggests that carpellody is dominant. The correlation between carpel number and temperature suggests that the amplitude of temperature fluctuations during the day was a determinant factor in the induction of carpellody.

scholarly journals Comparison of Various Soil Insecticides And Foliar Sprays for Soil Insect Control in Sweet Pota-Toes, Painter, Va, 1995

1996 ◽  
Vol 21 (1) ◽  
pp. 176-177
Author(s):  
John Speese
Keyword(s):  
Agricultural Research ◽  
Light Trap ◽  
Insect Control ◽  
Row Spacing ◽  
Insect Damage ◽  
Eastern Shore ◽  
Sweet Potatoes ◽  
Foliar Sprays ◽  
Soil Insecticides ◽  
Extension Center

Abstract Sweet potatoes were transplanted on 20 Jun at the Eastern Shore Agricultural Research and Extension Center, Painter. VA. Each plot consisted of 3 rows 20 ft long, planted on 3 ft row spacing. An untreated guard row separated each plot from each other. Treatments were replicated 6 times in a RCB design. In furrow and band treatments, and the initial foliar sprays were applied with a single nozzle boom backpack sprayer. Granular treatments were applied with a hand held shaker. The Mocap treatments were applied on 25 May to avoid phytotoxicity. The later foliar sprays were applied with a backpack sprayer using 6 flat fan nozzles/row and delivering 42 gal water/acre at 40psi. Thiodan sprays were applied on 7, 14, and 21 Jul. Sevin XLR was sprayed on 27 Jul in order to observe the restrictions on the number of applications allowed on the Thiodan label. Foliar sprays were applied in order to coincide with clickbeetle (adult wireworm) flights, as determined by the black light trap at Painter, VA. Layby treatments were applied on 26 Jul. On 11 Oct, the center row of each 3 row plot was harvested and 25 market sized roots were randomly selected, washed, and evaluated for insect damage.

scholarly journals 028 Amaranthus dubius Interference in Sweetpotato

HortScience ◽  
2000 ◽  
Vol 35 (3) ◽  
pp. 392F-393
Author(s):  
Maria de L. Lugo ◽  
Carlos E. Ortiz ◽  
Evelyn Rosa-Marquez
Keyword(s):  
Leaf Area ◽  
Block Design ◽  
Dry Weight ◽  
Yield Reduction ◽  
Agricultural Experiment Station ◽  
Area Index ◽  
Tropical Conditions ◽  
Randomized Complete Block Design ◽  
Agricultural Experiment ◽  
The Caribbean

Amaranthus dubius is a common weed in sweetpotato production throughout the Caribbean Basin. A field study was conducted in the Agricultural Experiment Station at Juana Diaz, P.R., during 1998 to determine the effect of A. dubius interference in sweetpotato production under tropical conditions. Interference was evaluated by using a randomized complete-block design with four replications. Plots were four 6.1-m rows divided into two sections for yield and growth determinations. Intraspecific and interspecific interference was measured for both species. A. dubius was grown at 15 and 30 plants per meter of row. Plant dry weight and leaf area were determined at 3, 6, 9, 12, 15, and 18 weeks after planting (WAP). Sweetpotato yield was determined at 29 WAP. A. dubius growing alone reached a maximum leaf area index (LAI) of 8.5 at 12 WAP. Sweetpotato, however, did not attain maximum LAI. When grown with A. dubius, sweetpotato biomass was reduced at 15 WAP. This reduction was 62% and 66% for 15 and 30 A. dubius plants per meter of row, respectively. Sweetpotato yield in weed-free plots was equivalent to 9232 kg/ha. Yield reduction was 96% for 15 A. dubius per meter of row and 100% for 30 plants.

scholarly journals Soil Insecticides for Insect Control in Field Corn, Painter, Va 1993

1994 ◽  
Vol 19 (1) ◽  
pp. 212-212
Author(s):  
John Speese
Keyword(s):  
Insect Control ◽  
Plant Spacing ◽  
Eastern Shore ◽  
Agricultural Experiment Station ◽  
Experiment Station ◽  
Field Corn ◽  
No Till ◽  
Agricultural Experiment ◽  
Soil Insecticides

Abstract Field corn was planted no-till on 7 May at the Eastern Shore Agricultural Experiment Station, Painter, VA. Treatments were applied pre-planting in the manner indicated in the table. Each plot consisted of four 25 ft rows bordered on each side by an untreated guard row. Plant spacing was 30 inches between rows with 9-10 inches between plants. Stand counts averaged 36 plants per 25 ft row on 28 May. The number of damaged whorls was counted in the 2 center rows (50 ft total) of each plot on 4 Jun and the number of damaged (stunted or twisted) stalks was counted in the 2 center rows (50 ft total) of each plot on 23 Jun.

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