scholarly journals Evaluation of Insecticides for Suppression of Sorghum Midge on Sorghum, 1994

1995 ◽  
Vol 20 (1) ◽  
pp. 231-231
Author(s):  
R. M. Anderson ◽  
G. L. Teetes
Keyword(s):  
Grain Yield ◽  
Grain Sorghum ◽  
Agricultural Experiment Station ◽  
Hollow Cone ◽  
Yield Data ◽  
Sorghum Midge ◽  
Plastic Bags ◽  
Agricultural Experiment ◽  
Clear Plastic ◽  
Spray Volume

Abstract Selected insecticides were evaluated for sorghum midge control at the Texas Agricultural Experiment Station Research Farm near College Station, TX. Hybrid grain sorghum (ATx399 × RTx430) was planted 20 May in rows spaced 30 inches apart. Insecticide treatments were compared in plots, 8 rows × 40 ft long, arranged in a RCB design with 4 replications. Insecticides were applied to the middle 2 rows of plots. Insecticides were applied between 0800 and 0900 hours CDT by using a hand-held backpack sprayer with TX-3 hollow cone nozzles at 35 psi, producing a finished spray volume of 5.6 gpa. Application began when 10-30% of the panicles were flowering; insecticides were applied 10, 13, and 16 Jul. Adult sorghum midge abundance was determined just prior to each application by counting the number of sorghum midges on 10 individual sorghum panicles enclosed in clear plastic bags. The panicles were cut from the plant and returned to the laboratory for examination and sorghum midge counts. Grain yield data were collected from the 2 middle rows per plot. Panicles were hand harvested from selected 8.75 ft sections of row/plot and mechanically threshed. Data were statistically analyzed by using ANOVA and LSD.

Interference of Three Annual Grasses with Grain Sorghum (Sorghum bicolor)

1990 ◽  
Vol 4 (2) ◽  
pp. 245-249 ◽  
Author(s):  
Brenda S. Smith ◽  
Don S. Murray ◽  
J. D. Green ◽  
Wan M. Wanyahaya ◽  
David L. Weeks
Keyword(s):  
Linear Regression ◽  
Grain Yield ◽  
Field Experiments ◽  
Grain Sorghum ◽  
Grass Species ◽  
Row Spacing ◽  
Yield Data ◽  
Weed Density ◽  
Annual Grasses ◽  
Wide Row Spacing

Barnyardgrass, large crabgrass, and Texas panicum were evaluated in field experiments over 3 yr to measure their duration of interference and density on grain sorghum yield. When grain yield data were converted to a percentage of the weed-free control, linear regression predicted a 3.6% yield loss for each week of weed interference regardless of year or grass species. Grain sorghum grown in a narrow (61-cm) row spacing was affected little by full-season interference; however, in wide (91-cm) rows, interference increased as grass density increased. Data from the wide-row spacing were described by linear regression following conversion of grain yield to percentages and weed density to log10. A separate nonlinear model also was derived which could predict the effect of weed density on grain sorghum yield.

scholarly journals Greenhouse Evaluation of Insecticides for Control of Yellow Sugarcane Aphid and Greenbug on Sorghum Seedlings, 1994

1995 ◽  
Vol 20 (1) ◽  
pp. 230-230
Author(s):  
R. M. Anderson ◽  
G. L. Teetes
Keyword(s):  
Grain Sorghum ◽  
Hollow Cone ◽  
Soil Mixture ◽  
Insecticide Application ◽  
Sugarcane Aphid ◽  
Greenhouse Evaluation ◽  
Seedling Plant ◽  
Plant Emergence ◽  
Spray Volume ◽  
Pre Treatment

Abstract Foliar treatments of 2 organophosphates and imidachloprid (Confidor) were evaluated for yellow sugarcane aphid (YSA) and greenbug (GB) control in a research greenhouse at Texas A&M University. Hybrid grain sorghum seedlings (ATx399 × RTx430) were grown in 110-mm germination pots containing a prepared soil mixture composed of peat, vermiculite, and periite in a 2:1:1 ratio, respectively. Four days after plant emergence and 3 d prior to insecticide applications, each seedling plant was infested with 10-20 YSA or GB. There were 5 singleseedling replications for each treatment. Insecticides were applied by using a CO2-pressurized backpack sprayer, through TX-3 hollow-cone nozzles at 35 psi, producing a finished spray volume of 5.6 gpa. Pre-treatment counts of YSA and GB were made the day of insecticide application; post-treatment counts of aphids were made 1, 2, and 3 DAT. Percent control was calculated by using Abbott’s (1925) formula. Data were statistically analyzed by using ANOVA and LSD.

scholarly journals Field Evaluation of Sorghum Midge-Resistant Sorghum Hybrids, 1993

1995 ◽  
Vol 20 (1) ◽  
pp. 366-367
Author(s):  
George L. Teetes ◽  
Roger M. Anderson ◽  
Bonnie B. Pendleton
Keyword(s):  
Field Evaluation ◽  
Field Trials ◽  
Kernel Weight ◽  
Agricultural Experiment Station ◽  
Sorghum Midge ◽  
Corpus Christi ◽  
Agricultural Experiment ◽  
College Station ◽  
Extension Center ◽  
Analyze Data

Abstract Seventeen F, sorghum hybrids of released and experimental parental lines arranged in a RCB design with 3 replications were evaluated for resistance to sorghum midge (SM) in duplicated field trials at the Texas Agricultural Experiment Station at College Station, TX and at the Texas A&M University Research and Extension Center at Corpus Christi, TX. Seed was sown 14 May in rows spaced 30 inches (76.2 cm) apart and 5 Apr in rows spaced 38 inches (96.5 cm) apart at College Station and Corpus Christi, respectively. Yield and damage ratings were used to evaluate hybrids of resistant by resistant parents, and resistant by susceptible parents, compared with hybrids of susceptible by susceptible parents. At College Station, 100-kernel weight also was determined. Rating of damage caused by SM was done at sorghum kernel physiological maturity where 1 = 1-10, 2 = 11-20, to 9 = 81-100% kernel loss. Panicles from plots were hand harvested (0.0025 ha) and threshed by using a stationary plot thresher. Grain yield was calculated by converting grain weight to kg/ha. ANOVA and LSD at the 0.05 probability level were used to analyze data.

scholarly journals Evaluation of Insecticides for Management of Sorghum Midge in Sorghum, 1997

1998 ◽  
Vol 23 (1) ◽  
pp. 278-278
Author(s):  
B. A. Castro ◽  
T. J. Riley ◽  
B. R. Leonard
Keyword(s):  
Grain Sorghum ◽  
Research Station ◽  
Silt Loam ◽  
Hollow Cone ◽  
Sorghum Midge ◽  
Damage Data ◽  
Charged System ◽  
Seed Yields ◽  
High Clearance

Abstract Selected insecticides were evaluated for control of sorghum midge in grain sorghum at the Macon Ridge location of the Northeast Research Station near Winnsboro, LA. Grain sorghum was planted in a Gigger-Gilbert silt loam on 6 Jun in 4-row plots (40-inch centers) X 60 ft. Treatments were arranged in a RCB design with four replications. In-secticide treatments were applied with a high clearance sprayer equipped with a CO2 charged system calibrated to deliver 6 gpa at 47 psi through TX-8 hollow-cone nozzles (2/row). All insecticides were applied on 5 Aug when an average of 25% of sorghum plants in the field were at some stage of yellow flowering. Sorghum midge damage to seed heads was evaluated in the field on 5 Sep by visually estimating the percent blasted kernels on each of 20 randomly selected panicles from the 2 center rows per plot. Sorghum seed yields were obtained on 10 Sep by mechanically harvesting the 2 center rows in each plot. Sorghum midge damage data were transformed [arcsin (x/100)] prior to ANOVA and DNMRT. Actual means are presented in the table.

Influence of quadrat sampling intensity on precision of grain sorghum yield data

1988 ◽  
Vol 28 (2) ◽  
pp. 211
Author(s):  
LJ Wade ◽  
JH Ladewig
Keyword(s):  
Grain Yield ◽  
Sampling Strategy ◽  
Grain Sorghum ◽  
Yield Data ◽  
Alternative Strategies ◽  
Quadrat Sampling ◽  
Sampling Intensity ◽  
Coefficients Of Variation

Variation in grain yield was studied within 3 contour bays of commercial grain sorghum. The objective was to determine the optimal quadrat sampling strategy for estimating mean grain yield of the whole bay, and of positions within the bay. A series of strategies were identified for attaining coefficients of variation (c.v.) of 5, 10 and 15%, using 9-m2 quadrat samples. For estimating the bay mean at a c.v. of 10%, the outcome preferred was to collect 1 quadrat sample at each of 6 positions (plots) within the bay. To estimate the plot mean at the same precision as the bay mean, 4 quadrat samples would be required at each position. In subsequent crops, a high correlation (r2=0.93) was obtained between estimates of mean grain yield from the chosen strategy and total bay yield from header harvesting. Alternative strategies to suit individual purposes may be identified from the data presented.

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 Evaluation of Insecticide Application Timing on Sorghum Midge Injury to Grain Sorghum, 1995

1996 ◽  
Vol 21 (1) ◽  
pp. 286-286
Author(s):  
B. A. Castro ◽  
T. J. Riley ◽  
O. I. Rodriguez ◽  
B. R. Leonard
Keyword(s):  
Grain Sorghum ◽  
Research Station ◽  
Silt Loam ◽  
Hollow Cone ◽  
Application Timing ◽  
Insecticide Application ◽  
Sorghum Midge ◽  
Charged System ◽  
Seed Yields ◽  
High Clearance

Abstract The test was conducted at the Macon Ridge Location of the Northeast Research Station in Franklin Parish, LA. Plots (28 ft X 8 rows) were planted on a Gigger-Gilbert silt loam on 15 Jun in a RCB design with 5 replications. Karate 1EC at 0.02 lb (AI)/acre was applied with a high clearance sprayer equipped with a CO2 charged system calibrated to deliver 9.3 gpa at 46 psi and 3.3 mph through TX-8 hollow-cone nozzles (2/row). Application timing for each treatment was determined by selecting and tagging 20 plants from the 2 center rows before spraying. For the 50% and 90% panicle emergence treatments, 10 and 18 plants, respectively, had panicles completely emerged with no open flowers. For the 20, 50 and 90% flowering treatments, 4, 10 and 18 of 20 tagged plants per plot, respectively, had flowering panicles. A panicle was considered to be flowering when the upper 25% portion had open spikelets. Treatments were applied on 28 Jul for the 50 and 90% panicle emergence and on 31 Jul for the 20, 50 and 90% panicle flowering. Sorghum midge damage to seed heads was evaluated on 24 Aug by estimating percent blasted kernels on each tagged plant. Sorghum seed yields were obtained on 8 Sep by manually harvesting panicles from the 20 tagged plants and by mechanically harvesting the entire 2 center rows in each plot.

EFFECT OF SOWING DATE ON GRAIN YIELD OF CRAB GRASS

2001 ◽  
Vol 49 (3) ◽  
pp. 293-297
Author(s):  
S. O. Bakare ◽  
M. G. M. Kolo ◽  
J. A. Oladiran
Keyword(s):  
Grain Yield ◽  
Interaction Effect ◽  
Significant Interaction ◽  
Sowing Date ◽  
Yield Data ◽  
Significant Interaction Effect ◽  
Sowing Dates

There was a significant interaction effect between the variety and the sowing date for the number of productive tillers, indicating that the response to sowing date varied with the variety. A significant reduction in the number of productive tillers became evident when sowing was delayed till 26 June in the straggling variety as compared to sowing dates in May. Lower numbers of productive tillers were also recorded when the sowing of the erect variety was further delayed till 10 July. The grain yield data showed that it is not advisable to sow the straggling variety later than 12 June, while sowing may continue till about 26 June for the erect variety in the study area.

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