scholarly journals Insecticidal Control of Fall Armyworm, Corn Earworm, and Corn Silkfly on Sweetcorn, 1997

1998 ◽  
Vol 23 (1) ◽  
pp. 103-103
Author(s):  
P. A. Stansly ◽  
J. M. Conner
Keyword(s):  
Fall Armyworm ◽  
Corn Earworm ◽  
Total Loss ◽  
Total Weight ◽  
Hollow Cone ◽  
Single Row ◽  
Foliar Damage ◽  
Delivery Pressure ◽  
Pre Treatment ◽  
Polyethylene Mulch

Abstract Six raised beds, 32 inches wide and 240 ft long on 6 ft centers, were prepared in a semiclosed subirrigated field: They were fumigated with 67/33% methyl bro-mide/chloropicrin at 220 lbs/acre, fertilized with a bottom mix of 700 lb/acre 5-16-8 and 250 lb/acre at 19-0-19 lb/acre top mix laid in 2 bands 4 inches in from the edge on each side of the bed and covered with black polyethylene mulch. An additional 40 lb of N/acre of 6-2-6 was injected on 16 May. Beds were divided into two, 3-row sets separated by a 15-ft roadway. The center row of each 3-row set was planted on 10 Mar to provide pest inoculum. The remaining 4 rows were each divided into 5 single row plots in a RCB design with 4 replications and planted 23 Apr by hand at 10 inch spacing. Five weekly applications were initiated 20 May using a high clearance sprayer equipped with 2 overhead nozzles fitted with ceramic Albuz “yellow” hollow cone noz-zles per row with delivery pressure of 200 psi at a rate of 22 gpa. A pre-treatment sample of 100 plants per block and 60 ears per inoculum row on 16 May showed that 24% plants were damaged (primarily by FAW) and 85% ears had CEW and 33% FAW. Foliar damage was evaluated weekly for 3 weeks on 20 randomly selected plants per plot after the initiation of the treatments. Damage was assessed as a percentage of the total loss from the top three leaves in the whorl. The number and size (in 3 categories) of larvae in each whorl was noted. Ears were harvested on 20 and 26 Jun from the same 20 plants in the center of each plot. Ears were evaluated for marketability noting total weight of ears in each category. Nonmarketable ears were further examined and any larvae present identified to species.

scholarly journals Lepidopterous Larvae Control with Insecticides, Pasquotank Co., N.C., 1995

1996 ◽  
Vol 21 (1) ◽  
pp. 99-99
Author(s):  
K. A. Sorensen ◽  
C. Wade Holloway
Keyword(s):  
Hollow Cone ◽  
Single Row ◽  
Foliar Damage ◽  
Direct Seeded

Abstract ‘Gourmet’ cabbage was direct seeded in early Mar near Weeksville, NC. Single row plots 10 ft. long on 42 inch centers were replicated 4 times in a RCB design. Alleys of 5 ft. were used between replicates. Treatments were applied with a CO2 pressurized backpack sprayer using a single hollow cone nozzle (18X) operating at 60 psi to deliver 54.5 gal/acre. Applications with Triton AG-98 (spreader) were made with all treatments 2, 9, 16 and 23 May. Visual estimates of foliar damage and insect counts were made 9, 16, 23 and 30 May. No CL were present on 9 and 16 May.

scholarly journals Corn Earworm and European Corn Borer Control with Insecticides, 1997

1998 ◽  
Vol 23 (1) ◽  
pp. 102-102
Author(s):  
K. A. Sorensen ◽  
C. Wade Holloway
Keyword(s):  
European Corn Borer ◽  
Sweet Corn ◽  
Corn Earworm ◽  
Hollow Cone ◽  
Corn Borer ◽  
Single Row ◽  
Untreated Area

Abstract ‘Golden Queen’ sweet corn was seeded on 22 I Apr near Calabash, NC in Brunswick Co. Single-row plots, 10 ft long on 42-inch centers, were replicated 4 times in a RCB design. Alleys of 5 ft were used I between replicates. Treatments were applied with a CO2-pressurized backpack sprayer using a single hollow-cone nozzle (18X) operating at 60 psi to deliver 54.5 gpa. Test 1 and Test 2 were in the same field with a 75 ft spacing of untreated area between the two test sites. Applications were made to both Test 1 and Test 2 twice a week on 27 and 30 Jun, and 3, 7, 10, 14, and 17 Jul. Insect-damaged ears were assayed on 21 Jul when all ears were harvested from both tests.

scholarly journals Control of Lepidopterous Larvae with Insecticides, Pasquotank Co., NC, 1994

1995 ◽  
Vol 20 (1) ◽  
pp. 78-78
Author(s):  
K. A. Sorensen ◽  
C. Wade Holloway
Keyword(s):  
Block Design ◽  
Hollow Cone ◽  
Single Row ◽  
Randomized Complete Block Design ◽  
Foliar Damage

Abstract ‘Blue Vantage’ cabbage was transplanted in late Jul near Weeksville, NC. Single row plots, 10 ft long on 42 inch centers were replicated 4 times in a randomized complete block design. Alleys of 5 ft were used between replicates. Treatments were applied with a CO2 pressurized backsprayer using a single hollow cone nozzle (18X) operating at 60 psi to deliver 54.5 gpa. Applications with Trigard AG-98 (spreader) were made with all treatments 22 Aug and 13, 20, and 27 Sep. No applications were applied between 22 Aug and 13 Sep. Counts were extremely low, and we allowed the DBM and CL populations to increase. A slight increase occurred and we applied treatments on 13 Sep. Visual estimates of foliar damage and insect counts were made 20 and 27 Sep and 3 Oct. No insects were present on 3 Oct.

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.

Natural Resistance of Native and Commercial Maize to Fall Armyworm, Spodoptera frugiperda, and Corn Earworm, Helicoverpa zea1, and Their Relationship with Ear Rot

2021 ◽  
Vol 46 (4) ◽  
Author(s):  
José Luis Arispe-Vázquez ◽  
Luis Alberto Aguirre-Uribe ◽  
Epifanio Castro-Del Ángel ◽  
Yisa María Ochoa-Fuentes ◽  
Ernesto Cerna-Chávez ◽  
...  
Keyword(s):  
Spodoptera Frugiperda ◽  
Fall Armyworm ◽  
Corn Earworm ◽  
Natural Resistance ◽  
Ear Rot

Effects of Bacillus thuringiensis Transgenic Corn on Corn Earworm and Fall Armyworm (Lepidoptera: Noctuidae) Densities

2007 ◽  
Vol 100 (2) ◽  
pp. 327-334 ◽  
Author(s):  
C. F. Chilcutt ◽  
G. N. Odvody ◽  
J. Carlos Correa ◽  
J. Remmers
Keyword(s):  
Bacillus Thuringiensis ◽  
Fall Armyworm ◽  
Corn Earworm ◽  
Transgenic Corn ◽  
Lepidoptera Noctuidae

scholarly journals Comparison of Pymetrozine (Cga 215944) and Imidacloprid (Provado) Foliar Sprays to Control Aphids in Tomatoes, 1996

1997 ◽  
Vol 22 (1) ◽  
pp. 185-185
Author(s):  
John Speese
Keyword(s):  
Agricultural Research ◽  
Test Field ◽  
Single Application ◽  
Eastern Shore ◽  
Hollow Cone ◽  
Potato Aphid ◽  
Single Row ◽  
Foliar Sprays ◽  
Extension Center ◽  
Aphid Populations

Abstract Tomatoes were transplanted on 9 Aug at the Eastern Shore Agricultural Research and Extension Center, Painter, VA. Each plot consisted of a single row 20 ft X 5 ft, bordered on each side by an untreated guard row. On 1 Oct, heavy potato aphid populations developed in the test field. A pre-count of live aphids on 5 randomly picked compound leaves/plot was taken on this date and followed by a single application of all treatments. Treatments were applied with a backpack sprayer equipped with a 3 hollow cone nozzle boom and delivering 46 gal water/acre at 40 psi. To evaluate efficacy, the plots were sampled as previously described for the pre-count on the dates indicated in the table.

Use of Rubidium to Label Corn Earworm 1 and Fall Armyworm 1 for Dispersal Studies 23

1978 ◽  
Vol 7 (3) ◽  
pp. 435-438 ◽  
Author(s):  
H. M. Graham ◽  
D. A. Wolfenbarger ◽  
J. R. Nosky ◽  
N. S. Hernandez ◽  
J. R. Llanes ◽  
...  
Keyword(s):  
Fall Armyworm ◽  
Corn Earworm

scholarly journals Bioactivity of Common Pesticidal Plants on Fall Armyworm Larvae (Spodoptera frugiperda)

Plants ◽  
2020 ◽  
Vol 9 (1) ◽  
pp. 112 ◽  
Author(s):  
Kelita Phambala ◽  
Yolice Tembo ◽  
Trust Kasambala ◽  
Vernon H. Kabambe ◽  
Philip C. Stevenson ◽  
...  
Keyword(s):  
Pest Management ◽  
Plant Species ◽  
Plant Extracts ◽  
Spodoptera Frugiperda ◽  
Larval Mortality ◽  
Fall Armyworm ◽  
Invasive Pest ◽  
Toxicity Tests ◽  
Contact Toxicity ◽  
Foliar Damage

The fall armyworm (FAW), Spodoptera frugiperda (Lepidoptera: Noctuidae) is a recent invasive pest species that has successfully established across sub-Saharan Africa where it continues to disrupt agriculture, particularly smallholder cereal production. Management of FAW in its native range in the Americas has led to the development of resistance to many commercial pesticides before its arrival in Africa. Pesticide use may therefore be ineffective for FAW control in Africa, so new and more sustainable approaches to pest management are required that can help reduce the impact of this exotic pest. Pesticidal plants provide an effective and established approach to pest management in African smallholder farming and recent research has shown that their use can be cost-beneficial and sustainable. In order to optimize the use of botanical extracts for FAW control, we initially screened ten commonly used plant species. In laboratory trials, contact toxicity and feeding bioassays showed differential effects. Some plant species had little to no effect when compared to untreated controls; thus, only the five most promising plant species were selected for more detailed study. In contact toxicity tests, the highest larval mortality was obtained from Nicotiana tabacum (66%) and Lippia javanica (66%). Similarly, in a feeding bioassay L. javanica (62%) and N. tabacum (60%) exhibited high larval mortality at the highest concentration evaluated (10% w/v). Feeding deterrence was evaluated using glass-fibre discs treated with plant extracts, which showed that Cymbopogon citratus (36%) and Azadirachta indica (20%) were the most potent feeding deterrents among the pesticidal plants evaluated. In a screenhouse experiment where living maize plants infested with fall armyworm larvae were treated with plant extracts, N. tabacum and L. javanica were the most potent species at reducing foliar damage compared to the untreated control whilst the synthetic pesticide chlorpyrifos was the most effective in reducing fall armyworm foliar damage. Further field trial evaluation is recommended, particularly involving smallholder maize fields to assess effectiveness across a range of contexts.

scholarly journals Evaluation of Efficacy of Selected Conventional and Experimental Insecticides and Bt Hybrids for Control of Corn Earworm and European Corn Borer on Sweet Corn, 1997

1998 ◽  
Vol 23 (1) ◽  
pp. 99-100
Author(s):  
J. T. Shaw ◽  
R. Weinzierl ◽  
J. W. Finger
Keyword(s):  
European Corn Borer ◽  
Sweet Corn ◽  
Corn Earworm ◽  
Compressed Air ◽  
Hollow Cone ◽  
Corn Hybrids ◽  
Corn Borer ◽  
Chemical Treatments ◽  
Untreated Check ◽  
High Clearance

Abstract The tests were arranged in a RCB design with four replications. Each plot consisted of four rows, each being 30 inches wide and 50 ft long. Thirty-foot-wide alleys were established between the four replications. Insecticides were applied to the middle two rows of each plot, leaving two untreated rows between adjoining plots. Twelve insecticide treatments were compared with two Br-sweet corn hybrids (Heritage Bt and Bonus Bt) and their non-Bt isolines to two untreated controls. The 12 chemical treatments and the two untreated checks were planted with the Silver King variety sweet corn. Two untreated check plots were included in each replication and were averaged for the ANOVA. Treatments were applied very four to five days beginning on 8 Aug at 8% silk. All insecticide treatments were applied with a modified John Deere 6000 high-clearance vehicle (HCV) with a rear-mounted boom. Six Conejet (TX VS-8) hollow-cone nozzles (three per row) were calibrated to deliver 30.1 gpa at 40 psi and a speed of 2.5 mph, utilizing a compressed air system. Four nozzles (two per row) were attached to drops and directed the spray towards the ear zone area, a third nozzle (one per row) was mounted directly over the row with the spray being directed into the whorl (tassel) area.

Sign in / Sign up

Export Citation Format

Share Document