General Information

FarmSaver.com will not be responsible for losses or damages resulting from use of this product in any manner not specifically recommended by FarmSaver.com. User assumes all risks associated with such nonrecommended use.


Quali-Pro Chlorothalonil 500 ZN, a flowable product containing chlorothalonil, is recommended for use as a spray for the control of many important plant diseases.

Quali-Pro Chlorothalonil 500 ZN is effective for use in programs that attempt to minimize disease resistance to fungicides. Quali-Pro Chlorothalonil 500 ZN has a multi-site mode of action and may be used to delay or prevent the development of resistance to single-site fungicides. Consult with your Federal or State Cooperative Extension Service representatives for guidance on the proper use of Quali-Pro Chlorothalonil 500 ZN in programs that seek to minimize the occurrence of disease resistance to other fungicides.


Quali-Pro Chlorothalonil 500 ZN can be used effectively in dilute or concentrate sprays. Thorough, uniform coverage is essential for disease control.

DO NOT combine Quali-Pro Chlorothalonil 500 ZN in a spray tank with pesticides, surfactants, or fertilizers, unless your prior use has shown the combination to be physically compatible, effective, and noninjurious under your conditions of use. DO NOT combine Quali-Pro Chlorothalonil 500 ZN with DiPel 4L, Foil, Triton AG-98, Triton B-1956, or Latron B-1956 as phytotoxicity may result from the combination when applied to crops listed on the label.

Note: Prior to pouring, slowly invert container several times to assure uniform mixture.

The required amount of Quali-Pro Chlorothalonil 500 ZN should be added slowly into the spray tank during filling. With concentrate sprays, premix the required amount of Quali-Pro Chlorothalonil 500 ZN in a clean container and add to the spray tank as it is being filled. Keep agitator running when filling spray tank and during spray operations.

Dosage rates on the label indicate pints of Quali-Pro Chlorothalonil 500 ZN per acre, unless specified otherwise. Under conditions favoring disease development, the high rate specified and shortest application interval should be used.


This product must not be applied within 150 feet, for aerial and air-blast applications, or 25 feet, for ground applications, of marine/estuarine water bodies unless that there is an untreated buffer area of that width between the area to be treated and the water body.

Limitations, Restrictions, and Exceptions


The following ornamental plant species which have been tested with Quali-Pro Chlorothalonil 500 ZN at recommended rates (1.9 teaspoons per 2 gallons of water, 7 to 14 day retreatment interval) did not exhibit phytotoxicity:

Note: DO NOT apply Quali-Pro Chlorothalonil 500 ZN to either green or variegated Pittosporium or to Schefflera, as multiple applications have been demonstrated to cause phytotoxic responses.