Important Terms used in Biological Control of Crop Pests – IV
Granulosis:
An insect viral disease characterized by the presence of minute granular inclusions (capsules) in the infected cells.
Gregarious Parasitoid:
An insect parasite which normally develops successfully at a rate of two or more individuals per arthropod host.
Heteroxenous:
Describes a species which require the use of more than one host species to successfully complete its annual life cycle.
Inclusion Body:
The proteinaceous or crystal like structure produced in insect cells infected with certain viral pathogens. (It occurs in various shapes and sizes and usually encloses a number of replicated virons).
Indigenous:
Native to a particular region or country.
Inundative Release:
A method of periodic introduction of biotic agents which is analogous to insecticide treatment in that a greater amount of the liberated material is used than is actually effective repetition m may be necessary and the effect is more less immediate.
International Unit (IU):
An arbitrarily set basis for comparing the efficacy of insect pathogenic Bacillus thuringiensis preparations. It is one thousand of the amounts of insecticidal activity contained in one million of a preparation of the primary standard E-61 strain B-t., as measured by bioassay against certain caterpillars e.g. A standard B-t. strain (HD-1-S-1971) has assigned a potency of 18000 IU/mg against the cabbage looper.
IOBC:
(International Organization for Biological Control of noxious animals and plants an affiliate for the International Union of Biological Sciences): A global organization of government units and individual interested in biological pest suppression headquartered in Zurich, Switzerland. Major objective include disseinination of information, coordination and promotion of research and application of biological pest suppression. Publisher of the journal, Entomophaga.