scholarly journals Control of Ear-Infesting Insects on Sweet Corn 1996

1997 ◽  
Vol 22 (1) ◽  
pp. 125-126
Author(s):  
S. M. Spangler ◽  
T. Grove ◽  
P. Rebarchak ◽  
D. Calvin
Keyword(s):  
Sweet Corn ◽  
Insect Damage ◽  
Sample Plot ◽  
Nozzle Pressure

Abstract One acre of sweet corn was planted on 27 Jun near University Park (Centre Co.), with rows 2.5 ft apart. The design was a RCB with 5 blocks per treatment. Plots (treatments within blocks) were two rows wide by 34 ft long, with three untreated rows between each treated pair of rows. Blocks were separated lengthwise by 10-ft alleyways. Sprays were delivered with a highclearance sprayer with two nozzles/row, set at tassel height, at a 45° downward angle. Sprays were applied at 72 gpa, with nozzle pressure at 64 psi, a tractor speed of 1.8 mph, and using TX-SS 10 nozzles from the Tee Jet company. Infestation of the planks in the “pre-tassel” stage (tassel visible but prior to anthesis) with ECB was 8% and with FAW larvae 44%. Anthesis was first observed on 20 Aug, and the first silks were observed on 22 Aug. The first spray was applied on 18 Aug. Additional sprays were applied on 22, 26, 29 Aug and 3 Sep. At harvest (11 Sep), 20 ears were picked randomly from each plot. For each ear, the numbers of ECB, FAW, and CEW were noted. For each 20-ear sample/plot, the proportions of the sample with insect damage at the tip, side, and shank were calculated.

scholarly journals Foliar Sprays to Control Ear-Invading Insects on Sweet Corn, 1997

1998 ◽  
Vol 23 (1) ◽  
pp. 95-96 ◽  
Author(s):  
James J. Linduska ◽  
Marylee Ross ◽  
Donna Baumann ◽  
Annika Parr
Keyword(s):  
Soil Type ◽  
Sweet Corn ◽  
Loamy Sand ◽  
Insect Damage ◽  
Fresh Market ◽  
Foliar Sprays

Abstract ‘NK-199’ sweet corn was planted in 4-row plots 100 ft in length on 29 May. Distance between rows was 3 ft. Distance between plants within the row was 8 inches. Plots consisted of 4 treatment rows with the center 2 rows serving as record rows. Plots were replicated 3 times in a RCB design. Sprays were applied with an International Harvester 770 Hi-Clear sprayer. The spray boom was adjusted to spray the silk area with each row being covered by 4 nozzles. The sprayer was equipped to treat 4 rows. All treatments were mixed in 10 gallons of water and applied at the rate of 25 gpa with 50 psi. Spray treatments were applied at 30% silk 21 Jul, 27 Jul, and 31 Jul, At harvest (8 Aug), 50 ears from the center 2 rows of each plot were husked and evaluated for insect damage for fresh-market (clean ears, no damage evident), processing (evidence of tip feeding but less than 3.6 cm tip damage), and culls (tip damage beyond 3.6 cm to the side and/or bottom). All insects found within the husk or ear were identified. The soil type was Norfolk “A” loamy sand.

scholarly journals SWEET CORN YIELD AND INSECT DAMAGE AS AFFECTED BY COVER CROPS AND NITROGEN

HortScience ◽  
1991 ◽  
Vol 26 (5) ◽  
pp. 489b-489
Author(s):  
Warren Roberts ◽  
Bob Cartwright
Keyword(s):  
Cover Crops ◽  
Soil Cover ◽  
Sweet Corn ◽  
Bare Soil ◽  
Corn Yield ◽  
Insect Damage ◽  
Hairy Vetch ◽  
Plastic Mulch ◽  
Black Plastic

The effects of cover crops and nitrogen on yield and insect damage of sweet corn were examined. In 1989, sweet corn was grown in bare soil plots, plots covered with rye (Secale cereale), and plots covered with hairy vetch (Vicia villosa). In 1990 a black plastic mulch treatment was substituted for the hairy vetch treatment. Each soil cover was fertilized with 45, 90, 134, or 179 kg/ha nitrogen (N) in 1989, and 34, 101, 168, 235, or 302 kg/ha N in 1990. Covers were planted in the fall, followed by sweet corn the following spring. There was no mowing or tilling of the cover crops. Corn yields were lower each year in the rye covered plots. There were more corn earworms on the rye covered plots. Corn pollination was poorer on the rye covered plots, but responded positively to increasing rates of N.

scholarly journals Control of Lepidopterous Larvae in Sweet Corn, 1994

1995 ◽  
Vol 20 (1) ◽  
pp. 85-85
Author(s):  
R. E. Foster ◽  
W. G. Buhler
Keyword(s):  
Sweet Corn ◽  
Block Design ◽  
Insect Damage ◽  
Feeding Damage ◽  
Hollow Cone ◽  
Randomized Complete Block Design ◽  
Over The Top ◽  
High Clearance

Abstract This test was conducted at the O’Neall Memorial Farm, Lafayette, Indiana. The sweet corn variety ‘Bodacious’ was planted 1 Jul in 30 inch rows. Each plot consisted of four rows by 50 feet long, arranged in a randomized complete block design with four replications. Insecticides were applied on 15, 22, 26, and 29 Aug. Treatments on the first two dates coincided with the occurrence of row tassel and the beginning of silk, respectively. Insecticides were applied with a high clearance sprayer operating at 40 psi and delivering 12 gal/acre of finished spray. There were three hollow cone nozzles per row, with one nozzle over the top of the row and one nozzle on each side of the row directed toward the ear zone. Evaluations were made at harvest on 12 Sep by examining twenty-five ears from each plot for the presence of larvae and feeding damage. Each ear was rated as clean (no insect damage), marketable (damage limited to terminal one inch of the ear), or unmarketable (damage extended beyond the terminal inch of the ear).

scholarly journals Developing Protocols for Fall Sweet Corn Production in the South-central United States

2016 ◽  
Vol 26 (4) ◽  
pp. 417-425
Author(s):  
Brian A. Kahn ◽  
Lynn P. Brandenberger
Keyword(s):  
Sweet Corn ◽  
Genetic Resistance ◽  
Critical Factor ◽  
Field Studies ◽  
Insect Damage ◽  
Seeding Rate ◽  
Planting Dates ◽  
South Central ◽  
Favorable Period ◽  
Mammalian Toxicity

Field studies were conducted in Oklahoma from 2010 to 2012 to develop protocols for fall sweet corn (Zea mays) production. Variables examined included a transgenic cultivar that expresses the CryIA(b) toxin from the bacterium Bacillus thuringiensis (Bt) and its nontransgenic near-isoline, seeding rates and planting dates, and various insecticide regimens. We found that, in eastern Oklahoma, a suitable planting window would correspond roughly to the last 2 weeks in July. Within this favorable period and given timely irrigation, it was possible to sow corn to an acceptable stand. A seeding rate ≈1½ times the desired final stand of one plant/ft appeared to be satisfactory. Use of a cultivar (GSS-0966) with genetic resistance to lepidopteran pests was a critical factor for successful production of fall sweet corn. Efforts to produce a crop with a nontransgenic cultivar using insecticides with relatively low mammalian toxicity were unsuccessful. Our experiments support previous recommendations for applying supplemental insecticides to transgenic Bt sweet corn to potentially increase production of “premium” ears by reducing the percentage of ears with severe insect damage (damage >1½ inches from the cob tip). We demonstrated that a spray schedule that rotated two insecticides with intermediate mammalian toxicity (carbaryl and permethrin) was as effective in reducing severe insect damage to ears of ‘GSS-0966’ as a similar schedule that rotated two highly toxic insecticides (esfenvalerate and methomyl).

Reduction in Insect Damage to Cucumbers, Tomatoes, and Sweet Corn Through Use of Electric Light Traps1

1971 ◽  
Vol 64 (5) ◽  
pp. 1241-1249 ◽  
Author(s):  
J. R. Barrett ◽  
H. O. Deay ◽  
J. G. Hartsock
Keyword(s):  
Sweet Corn ◽  
Insect Damage ◽  
Electric Light

The problem of the primary reduction of species in the analysis of general geobotanical tables and the elaboration of analytic programs

2001 ◽  
pp. 99-106 ◽  
Author(s):  
Yu. N. Neshatayev
Keyword(s):  
Vegetation Classification ◽  
Sample Plot ◽  
Herb Layer ◽  
Huge Amount ◽  
Species List ◽  
Community Types ◽  
Primary Reduction

If one processes a huge amount of data when es­tabli­shing the vegetation classification, it appears necessary to use the uniform algorithms of analysis. Such goals as distinguishing the reliable community types (associations or other syntaxa) involve the operational reduction of either the species list, or (more seldom) the sample plot set. This is especially useful for the analysis of multi­specific communities of meadows, steppes, or another types of markedly continuous polydominant vegetation with «fuzzy» structure of the herb layer.

Sweet Corn ToppingTrial

2007 ◽  
Author(s):  
Henry G. Taber ◽  
Vincent Lawson
Keyword(s):  
Sweet Corn

Sweet Corn Cultivar Trial

2010 ◽  
Author(s):  
Vincent Lawson
Keyword(s):  
Sweet Corn
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