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Dormant spray Chemical applied in winter or very early spring before treated plants have started active growth. ...
Dose (rate) The terms are the same; however, rate is preferred. Refers to the amount of active ingredient applied to a unit area regardless of percentage of chemical in the carrier. ...
Drift The movement of airborne particles by air motion or wind away from the intended target area. ...
Dry flowable (DF) Formulation made of finely ground herbicide particles compressed into granular particles that can be suspended readily in water for application. ...
Emergence The act of a germinating seedling's breaking through the soil surface. ...
Emetic A material used to cause vomiting to rid stomachs of poisonous compounds. ...
Emulsifiable concentrate (EC) A concentrated herbicide formulation containing organic solvents and adjuvants to facilitate emulsification with water. ...
Emulsifier A surface-active substance that promotes the suspension of one liquid in another. ...
Epinasty Twisting or curling of leaves and stems caused by uneven growth of cells. This is a characteristic reaction from treatment with 2,4-D and other growth regulators. ...
Ester A compound formed by reaction of an acid and an alcohol accompanied by the loss of water formed during the reaction. ...