crop protection 3.3 Flashcards
what is an annual weed?
a weed that completes its life cycle within one year
what is biological control?
the reduction of a pest population by the deliberate introduction of one of its natural predators
what is chemical control?
means of control of weeds, pests and pathogens using herbicides, pesticides and fungicides
what is a contact herbicide?
type of non-selective herbicide that destroys all green plant tissue which it meets
what is crop rotation?
agricultural practice whereby each of a series of different crop plants is grown in turn on the same piece of ground
what is cultural control?
traditional non-chemical means of controlling weeds, pests and pathogens that affect crop plants
what is integrated pest management?
combination of techniques including chemical, biological and cultural means of control
what is a monoculture?
a vast population of a single species cultivated for economic efficiency
what is a pathogen?
a disease-causing micro-organism
what is a perennial weed?
a weed that continues to grow for several years
what does persistent mean? ***
non-biodegradable chemical whose molecules accumulate along a food chain
what is a pesticide?
a chemical used to control pests
what does resistant mean?
a type of pest that survives treatment by a pesticide and enjoys a selective advantage
what is a selective herbicide?
a type of herbicide that mimics plant growth substances and kills broad-leaved plants by stimulating there growth to a harmful extent
what is a systemic herbicide?
a type of herbicide that is absorbed by a plant and transported internally to all parts where it has a lethal effect
