Author: kratzer.11

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We want to introduce and welcome Amanda Perkins as the new Program Assistant for 4-H, ANR & CD to OSU Extension Brown County! She will start on October 25th in this new role. Amanda has a background in 4-H and natural resources and will be assisting in office coverage, and all Extension programming. Our campers and counselors may recognize her as a familiar face from 4-H camp. Please join us in welcoming her to the office!

Forage Fertility Research Update

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Plot harvest is planned to happen in the coming days. We collected 26 samples from our soon-to-be treatment rows. The entire field has had the same seeding rate and rate of 9-23-30 fertilizer applied. Sample taken this week will be used to measure our change after multiple rates of 0-0-60 are applied late this year.

Soybeans Field Report

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FARM #1: RIPLEY-A
Plant Date: April 28, 2021

Full Site available at: go.osu.edu/fieldreport 

Report Date: May 10, 2021

Description: Emergence started.

Growing Degree Day since planting: ~100

Total Growing Degree Day since 01/01/21: 435

Report Date: May 20, 2021

Growing Degree Day since planting: ~100

Total Growing Degree Day since 01/01/21: 435

Growth: Wide Variety of seedling stages (non-emerged to VC). Some seeds still in the soil were rotten and others were still viable and germinating.

 

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Pest: Bean Leaf Beetles (BLB) and foliar damgae presesnt.

Source: Hammond, et al. Bean Leaf Beetle on Soybean, Ohioline.osu.edu

  • Description: BLB can overwinter in the adult stage and will pass through 2 generations in Ohio. Overwintering adults are found now feeding of soybean foliage. 2nd generations appear around August and September.
  • Early Seaon Scouting and Damage: As with this field, early planted fields can become a trap crop for the first generation, especially if minimal soybeans are emergend in surrounding areas. However, economic injury is rare at this stage. “Severe leaf feeding can cause significant damage and should be stopped if defoliation goes over 50%, plants are being stunted, and beetles are still actively feeding.”  The foliar damge foud in this field ranged from 5-10%.
  • Late Season and Scouting: Later planted soybeans that are still green in September can also serve as a trap crop if others nearby have reach physiological maturity. “Scouting, sweeping for population or for defoliation assessment, pull 20 plants and estimate damage among entire plant. Rescue treatment is justified when defoliation exceeds: 40% prior to bloom, 15% from bloom to pod-fill, and 25% after pod-fill to plant yellowing.” BLB can slaco vector bean pod mottle virus (BPMV.) “Infection by this virus results in plants that remain green well past harvest maturity, with seeds that often are severely mottled”
  • More details on identification and management:
    1. Ohio Sate Bean Leaf Beetle Fact Sheet | https://ohioline.osu.edu/factsheet/ENT-23

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Alfalfa Field Report

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MAY 7, 2021

1. Farm Name & Location: Georgetown-1A

Growing Degree Day Accumulation (GDD): 419

Pest: Alfalfa Weevil

Description: Alfalfa plants had moderate to high levels of defoliation in the upper canopy. 30 stems were collected and a total of 31 weevil larva were found. Ranging from 1st instar to 3rd instar.

FoliarImage B

Management: This field’s average plant height was 14″ tall. When using the chart below, the 14” height and the average of 1 insect per plant, there is no immediate control needed. GDD accumulation is ahead of our average Souther, Ohio. Weevil damage is commonly kept at lower levels by parasitic wasps and a type of fungal pathogen. Sevre damage is also normally closer to harvest and an early harvest can be used to reduce further damage. Producers should watch the regrwoth very closely for weevil feeding.

In this situtation the level of defoliation was higher than expected for this early in the season. Therfore, we will collect samples from this field again in 3 days and if defoliation increases, a rescue treatment of an insecticide may be warranted.

Alfalfa Weevil Thresholds

More Information: 

  1. More information about scouting, managment, and lifecycles can be found at: Alfalfa Weevil on Alfalfa| Ohioline Fact Sheet
  2. Specific chemical control options can be found at: Control of Insect Pests of Field Crops | PDF

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2. Farm Name & Location: Russellville-1A

Growing Degree Day Accumulation (GDD): 419

Pest: Alfalfa Weevil

Description: Alfalfa plants had low to high levels of defoliation in the upper canopy. 30 stems were collected and a total of 45 weevil larva were found. Ranging from 1st instar to 3rd instar. Overall, more quantity of early instart weevils and less foliar damage as compared to Georgetown-1A.

foliarweevil

Management: This field’s average plant height was over 16 ” tall. When using the chart below, the 16” height and the average of 1 insect per plant, there is no immediate control needed. GDD accumulation is ahead of our average Southern Ohio. Weevil damage is commonly kept at lower levels by parasitic wasps and a type of fungal pathogen. Severe damage is also normally closer to harvest and an early harvest can be used to reduce further damage. Producers should watch the regrwoth very closely for weevil feeding.

We will collect samples from this field again in 3 days and if defoliation increases, a rescue treatment of an insecticide may be warranted.

Alfalfa Weevil Threshold

More Information: 

  1. More information about scouting, managment, and lifecycles can be found at: Alfalfa Weevil on Alfalfa| Ohioline Fact Sheet
  2. Specific chemical control options can be found at: Control of Insect Pests of Field Crops | PDF