Dry Bean Pest Summary (02/21/2008):

We will resume this section as the growing season progresses.

Indicates new or upgraded reports during the last week

Region	Bacterial Blights•*	Rust*	White Mold*
Disease Forecast Threshold:	2005 Season Summary	2005 Season Summary	2005 Season Summary
Arkansas Valley (Avondale)	Light	No Reports []	No Reports []
So. Platte (Sterling)	Light to Moderate	No Reports []	No Reports []
Northeastern Colorado (Holyoke)	Light to Moderate	No Reports []	Scattered Reports []
Eastern Colorado (Burlington)	Light to Moderate	No Reports []	Scattered Reports []
West Slope (Delta)	No Reports	No Reports []	No Reports []
Southwest (Dove Creek)	No Reports	No Reports []	No Reports []
• Includes Halo Blight, Bacterial Brown Spot, and/or Common Bacterial Blight * [ ] = Current disease threshold estimate for the region; refer to Pesticide Decision Strategy Worksheets

Disease Threats:

Bacterial Disease Alert:

There are limited reports of bacterial diseases, including Common Blight, Halo Blight and Brown Spot in eastern Colorado. Maintain a rigorous scouting program, and consider copper-based bactericides such as Kocide, Champ, NuCop, Cuprofix, Nordox, or TopCop, applied according to label directions.

Scout all fields for signs of infection (lesions, chlorosis, sporulation) by fungal diseases such as Rust and White Mold; most of our acreage is planted to rust-susceptible varieties. In fields with a history of white mold, vine-type varieties, and moderate to heavy fertility and water, consider application of a protectant fungicide spray with Topsin M or Endura (Boscalid) at 100% to full bloom. These products are very effective if applied to blossoms so that the fungus cannot colonize the treated flowers and initiate disease on stems and pods. The disease can also be slowed down by extending intervals between irrigations late in the season.

Pesticide options are listed in the Bean Pesticide Summary and the Pest Summary.

White Mold Alert:

In fields with a history of white mold, vine-type varieties, and moderate to heavy fertility and water, consider application of a protectant fungicide spray with Topsin M or Endura (Boscalid) at 100% to full bloom. These products are very effective if applied to blossoms so that the fungus cannot colonize the treated flowers and initiate disease on stems and pods. The disease can also be slowed down by extending intervals between irrigations late in the season.

Bean Rust Alert:

Last fall, we scouted areas in western Nebraska with confirmed reports of bean rust in 2003 and 2004. The potential exists in 2005 for new rust outbreaks on susceptible varieties of beans growing in eastern Colorado if the sexual stage of rust is completed in other production areas and spores are blown into our area. So aggressively scout new-crop beans before flowering and if confirmed in the field or nearby area, apply protective and systemic fungicides (Maneb/Manex, Bravo/Terranil, Quadris, Headline, Endura). Always check label for rates, intervals and pre-harvest interval.

Thrips Alert:

SUMMARY OF Bean Disease IPM STATEGIES:

• Rotate out of dry beans for at least 2 years.
• Eliminate bean debris and sources of volunteer beans during the fall of 2006 and spring of 2007.
• Plant high quality, certified, treated seed of disease resistant varieties, if available and suitable for your market needs.
  Follow recommended production practices to avoid stress from extremes of moisture, temperature, and soil compaction.
• Manage water and fertilizer inputs to provide adequate, but not excess components for the crop need to avoid excess canopy development.
• Carefully scout fields to detect foliar infection as early as possible, get confirmation of disease diagnosis from appropriate experts.
• Monitor reports on weather patterns, disease forecasts, and confirmed sightings in your region via the CSU VegNet.
  When infection is confirmed in or near your field, implement a timely program of fungicides and bactericides with protectant and systemic modes of action. Rotate appropriate fungicide chemistry, apply labeled rates, and stay within recommended spray intervals.
• Adjust combine at harvest to maximize seed quality, and reduce loss of seed which can germinate next spring to produce volunteer plants.
• Thoroughly incorporate each season's crop debris + pathogens to reduce carryover and potential disease pressure the following season. Rely upon cultivation and herbicide in next year's rotation crop to reduce volunteer bean emergence and possible infection by pathogens which can then be spread to next year's host crop.