PYTHIUM ROOT ROT

ethazole**

+++

2

aromatic hydrocarbon

Koban, Terrazole

mefenoxam

+++

6

phenylamide

Subdue, Fenox, Mefenoxam, Quell

propamocarb

?

2

carbamate

Banol

fosetyl-Al**

?

2

phosphonate

Signature

phosphorous acid

?

2

phosphonate

Alude, Magellan, Vital, Resyst

azoxystrobin

?

6

QoI

Heritage

fluoxastrobin

?

6

QoI

Disarm

** Not for application to residential lawns. 

Footnotes:

(1)

Efficacy Codes:

++++

excellent control when conditions are highly favorable for disease development

+++

good control when disease pressure is high, or excellent control when disease pressure is moderate

++

good control when disease pressure is moderate, excellent control when disease pressure is low

+

good control when disease pressure is low

0

does not provide adequate control under any conditions

?

cannot be rated due to insufficient data

(2)

Resistance Risk:

1

Rotating and tank-mixing not necessary, but recommended to avoid potential side effects from continuous use of same chemical class.

2

Rotate to different chemical class after 3-4 applications; tank-mixing not necessary.

3

Rotate to different chemical class after 2-3 applications; tank-mixing not necessary.

4

Rotate to different chemical class after 1-2 applications; tank-mixing not necessary.

6

Rotate to different chemical class after 1-2 applications; tank-mixing with low or moderate risk product recommended.

9

Rotate to different chemical class after EVERY application; tank-mix with low or moderate risk product for EVERY application.

(3)

Continual use of fungicides with similar control mechanisms (modes of action) can result in fungi that are resistant to some chemicals. Poor or ineffective disease control can be expected when this occurs. Managers can reduce the chances of this happening by mixing or alternating fungicides belonging to different chemical classes.

(4)

Recommendations of specific chemicals are based upon information on the manufacturer's label and performance in a limited number of trials. Because environmental conditions and methods of application may vary widely, performance of the chemical will not always conform to the safety and pest control standards indicated by experimental data. When more than one brand name exists for an agricultural chemical, the name of brand that first came onto the market is listed first. Otherwise, brand names are listed in alphabetical order. The order in which brand names are given is not an indication of a recommendation or criticism.

Recommendations for the use of agricultural chemicals are included in this publication as a convenience to the reader. The use of brand names and any mention or listing of commercial products or services does not imply endorsement by North Carolina State University or discrimination against similar products or services not mentioned. Other brand names may be labeled for use on turfgrasses. Individuals who use agricultural chemicals are responsible for ensuring that the intended use complies with current regulations and conforms to the product label. Be sure to obtain current information about usage regulations and examine a current product label before applying any chemical. For assistance, contact your county's Cooperative Extension agent.