Washington State Pesticide License Exam Review: Aquatic Terms and Other Need to knows

Washington State Pesticide License Exam Review: Aquatic Terms and Other Need to knows Abatement to reduce a population of public health pests abscission the formation of a layer of cells which cause the fruit, leaf, or stem to fall off a plant activator material used in a pesticide formulation to increate the effectiveness of the toxic materials acute oral LD50 the single oral dosage required to kill 50% of the test animals in toxicity studies acute toxicity the amount of a substance, as a single dose, which causes poisoning in a test animal adjuvant enhances effectiveness adsorption adherence of a substance to a surface alkalinity containing sodium and potassium carbonate salts anti-siphoning device a device attached to a filling hose to prevent water in the spray tank from draining back into the water source back-siphoning fluid or spray material siphoning from a sprayer back to an original water source biocide chemical that has a wide range of toxic properties, usually killing plants and animals. biological control controlling a pest by natural enemies, including competitive plants. may occur naturally or may need to be introduced. biopesticide a biological agent formulated for application such as bacillus thuringiensis which attacks insect larvae boom a section of tubing to which several nozzles are attached for applications to wide areas calcareous containing an excess of calcium, usually in the form of the compound calcium carbonate. limy. calibration determination of application equipment deliver rate per unit area carrier a gas, liquid, or solid substance used to dilute, propel, or suspend a pesticide during its application cholinesterase an enzyme found in animals that regulates the activity of nerve impulses (Organophosphates, carbamates) contact herbicide a herbicide that is phytotoxic by contact with plant tissue rather than as a result of translocation deflocculating agent material added to suspension to prevent particles from clumping together and settling out of spray tanks dessicant accelerate the drying of plant tissue diapause a period of spontaneous dormancy or suspended animation between periods of activity in arthropods