Abiotic disorder - correct answer A non-pest plant stress such as improper nutrition, too much or too little water, winter or frost injury
Action
... [Show More] threshold - correct answer The pest density at which action (such as pesticide application) is justified to prevent further damage.
Adelgid - correct answer An insect closely related to aphids that feed on conifers. Their feeding often causes galls to form.
Aesthetic injury level - correct answer The point at which damage from a pest becomes noticeable enough to negatively affect the visible quality of the plant. This may vary, based in part on the distance the plant is located from walkways. (and therefore, on the likelihood of the damage being observed.
Airblast sprayer - correct answer Pesticide application equipment that uses a stream of air from a fan to break up and distribute the pesicide onto the plant that is being treated.
Allelopathy/allelopathic - correct answer When one plant species suppresses the growth of another. For example, walnut trees produce chemicals that will not allow plants to grow under their canopies.
Annual - correct answer A plant that completes its life cycle and dies in a single year or growing season.
Bacteria - correct answer A group of single-celled microorganisms, of which there are typically 40 million in a gram of soil. A few species are the causes of diseases such as fire blight and leaf spot in plants.
Bactericide - correct answer A pesticide used to manage a disease cause by bacteria
Balled and burlapped - correct answer A standard method used to wrap a tree or shrub rootball with burlap to keep the soil around the roots when digging the plant from the field to move it for transplanting. Often, larger trees will have a wire mesh placed around the burlap to provide more support for transporting. The wire mesh should be removed prior to planting. The burlap should (optimally) be removed as much as possible also, as amany types of modern burlap contains synthetic fibers that will not rot. If the burlap is natural fibers it should at least be removed from the top one-third of the rootball to avoid the burlap being exposed to the air and wicking moisture from the roots. Also called B&B.
Basal Drench - correct answer The mixing of a pesticide in a small volume of water and applying to a 12-18 inch strip around the base of a tree or shrub. These compounds are normally systemic and are absorbed by the roots of the plant.
Beauveria bassiana - correct answer A naturally occurring fungus that attacks a number of insects and has been formulated as an insecticide.
Beneficial Insect - correct answer Insects that eat or develop inside or on pest insects. Sometimes just referred to as "beneficials." Beneficial insects do not damage landscape plants.
Biennial - correct answer A plant with a two-year life cycle.
Biochemical pesticide - correct answer A biologically derived chemical such as insect sex pheromones that are used for pest control. They have the advantages of being non-toxic and specific for controlling a particular species of pest.
Biocide - correct answer A substance that kills biological organisms.
Biological control - correct answer A method of controlling a pest by encouraging and using natural controls such as parasitism, predation, and naturally occuring diseases.
Biomagnification - correct answer A situation in which a predatory organism continues to absorb pesticde as it eats prey that has been exposed to nonlethal levels of pesticide; the accumulation of pesticide in the predator can lead to its death.
Biopesticide - correct answer Pesticides cerived from natural materials such as animals, plants, bacteria and certain minerals. [Show Less]