Sweetpotato scurf more prevalent this year

decrease font size  Resize text   increase font size       Printer-friendly version of this article Printer-friendly version of this article

click image to zoomFigure 1. Sweetpotato storage roots with varying degrees of scurf. Each year some sweetpotato scurf or “soil-stain” is reported. However, this year it would appear that the disease has been more prevalent than normal in some fields. Scurf is caused by a soil-dwelling fungus, Monilochaetes infuscans, and results in darkened, discolored skin (Figure 1). The affected portion of the root can range from a small patch to nearly the entire storage root surface. The injury is considered by most to be superficial because the sweetpotato flesh below the stained skin surface is normal (Figure 2), and the sweetpotato maintains the same eating quality. However, affected roots are considered unacceptable for the fresh market.

click image to zoomFigure 2. Scurf injury is not evident below the skin surface or in the flesh of the storage root. Here is what you need to know:

  • The fungus associated with the disease has a narrow host range- namely sweetpotatoes and morningglories.
  • The fungus can typically survive 1-2 years in the soil.
  • The fungus is primarily spread on plant material- infected roots that are bedded for seed, for example.
  • The pathogen can spread from infected roots to adjacent healthy roots when stored under conditions of high humidity.
  • In storage, scurf-infected sweetpotatoes lose water faster than healthy sweetpotatoes.

How to manage scurf:

  • Use scurf-free sweetpotatoes for seed.
  • Treat seed roots with Mertect and/or Botran before or at plant bed establishment.
  • Establish plant beds in fields with a scurf-free history.
  • Cut slips at least 1” above the soil surface.  Pulling slips is a good way to move this and other pathogens into the production field and should be avoided.
  • In problematic fields, avoid planting sweetpotato for at least 2 years. Rotating out of sweetpotato for up to 4 years may be necessary if the pathogen is well-established.
  • Control morningglory weeds, especially in rotational crops, to avoid providing the pathogen with a host in non-sweetpotato production years.
  • When possible, avoid storing scurf-invested sweetpotatoes in bins of healthy sweetpotatoes.

Buyers Guide

Doyle Equipment Manufacturing Co.
Doyle Equipment Manufacturing prides themselves as being “The King of the Rotary’s” with their Direct Drive Rotary Blend Systems. With numerous setup possibilities and sizes, ranging from a  more...
A.J. Sackett Sons & Company
Sackett Blend Towers feature the H.I.M, High Intensity Mixer, the next generation of blending and coating technology which supports Precision Fertilizer Blending®. Its unique design allows  more...
R&R Manufacturing Inc.
The R&R Minuteman Blend System is the original proven performer. Fast, precise blending with a compact foot print. Significantly lower horsepower requirement. Low inload height with large  more...
Junge Control Inc.
Junge Control Inc. creates state-of-the-art product blending and measuring solutions that allow you to totally maximize operating efficiency with amazing accuracy and repeatability, superior  more...
Yargus Manufacturing
The flagship blending system for the Layco product line is the fully automated Layco DW System™. The advanced technology of the Layco DW (Declining Weight) system results in a blending  more...
Yargus Manufacturing
The LAYCOTE™ Automated Coating System provides a new level of coating accuracy for a stand-alone coating system or for coating (impregnating) in an automated blending system. The unique  more...
John Deere
The DN345 Drawn Dry Spreader can carry more than 12 tons of fertilizer and 17.5 tons of lime. Designed to operate at field speeds up to 20 MPH with full loads and the G4 spreader uniformly  more...
Force Unlimited
The Pro-Force is a multi-purpose spreader with a wider apron and steeper sides. Our Pro-Force has the most aggressive 30” spinner on the market, and is capable of spreading higher rates of  more...
BBI Spreaders
MagnaSpread 2 & MagnaSpread 3 — With BBI’s patented multi-bin technology, these spreaders operate multiple hoppers guided by independent, variable-rate technology. These models are built on  more...


Comments (0) Leave a comment 

Name
e-Mail (required)
Location

Comment:

characters left


Smooth Wall Grain Bins

Meridian’s SmoothWall bins are the ultimate storage bins, used to handle and store fertilizer, grain, feed and seed, and extend ... Read More

View all Products in this segment

View All Buyers Guides

Feedback Form
Feedback Form