PCNB Critical Uses: Colorado

Date: February 22, 2005

To: Rick Melnicoe, Director
WIPMC

From: Sandra K. McDonald
Environmental & Pesticide Education Specialist
Colorado State University

Subject: PCNB

Of these crops, only peppers and potatoes would apply to Colorado.

There are uses on Peppers

Potato

PCNB (Blocker) has a Federal Label for Rhizoctonia Stem Canker and Black Scurf (Rhizoctonia solani) 1.65 lb or 10.4 fl oz per 1000 linear ft row. It is critical as a different fungicide class, activity in soil.

Other products that are available include Quadris, Topsin & Fludioxinil .

Other IPM approaches include crop rotation, cultivars that are less susceptible, high quality seed pieces.

Additionally, this product is widely used in high altitude golf courses for control of snow mold. The amount of product is probably relatively small considering the total acreage. If you figure 20 acres per course, and probably 20 courses, that's 400 acres at a rate of about 20lb/acre. It is still a very important compound for snow mold control. It is used occasionally in the greenhouse industry but the amount is very small.

Sandra K. McDonald
Environmental & Pesticide Education Specialist
Colorado State University
Phone: (970) 491-6027
Fax: (970) 491-3862
Web site