General Information


Diazinon 50W is a wettable powder which, when diluted with water according to the directions, is intended for the control of insect pests of agricultural crops and other plants. Do not use in greenhouses. Do not use in barns or dwellings. Do not use on livestock. Aerial application is prohibited, except as allowed on the label for use on lettuce.

In the directions for use which follow, best control is obtained when application is made when infestation is noticed. To avoid spray drift, do not apply under windy conditions. Avoid spray overlap, since crop or plant injury may result. Failure to follow the directions for use and precautions on the label may result in poor insect control, crop injury, or illegal residues.

When an adjuvant is to be used with this product, Makhteshim Agan of North America, Inc. suggests the use of a Chemical Producers and Distributors Association certified adjuvant.

Do not use water from treated cranberry beds for drinking purposes or to irrigate crops other than those appearing on EPA approved diazinon labels.

Note: The California Department of Pesticide Regulation has set a 5-day reentry period for diazinon on peaches and nectarines. Five days should elapse between the time of application and the time a worker may enter the field to engage in any activity requiring substantial contact with treated foliage. When a mixture of two or more organophosphate pesticides are applied in combination, the interval should be prolonged by adding to the largest applicable interval an additional 50% of that interval.


The required days to wait between the last application and harvest are given in ( ) after each crop name.

Limitations, Restrictions, and Exceptions


Before treating a large number of ornamental plants with Diazinon 50W alone or as a tank mixture with any other material, make a test application on a few plants and observe for 7 to 10 days prior to treating large areas to reduce the possibility of plant injury.

- Apply as a thorough foliar spray when adults first appear. Try to spray underside of leaves and penetrate dense foliage.

- Apply the recommended rates. Spray when listed pests first appear. Try to spray underside of leaves and penetrate dense foliage.

- Do not use on Ferns, Poinsettia, Hibiscus, Papaya, Pilea, and Gardenia since injury plants may occur.

- The maximum application rate on all ornamentals is 2 lbs. of product per acre.

- Make a maximum of one application per crop cycle.

- The REI is 7 days for flowers and other commercial ornamentals grown for cutting.

- The REI is 2 days for all other commercial ornamentals.

- Application is permitted only on commercial ornamentals grown outdoors in nurseries.

Restricted Entry Interval

2 days

Exception: If the product is soil-injected or soil-incorporated, the Worker Protection Standard under certain circumstances allows workers to enter the treated area if there will be no contact with anything that has been treated.