DEVELOPMENT OF SAMPLING PLAN AND SPATIAL DISPERSION OF NATURAL POPULATION OF Cryptolaemus montrouzieri Mulsant (COLEOPTERA: COCCINELLIDAE) IN A GUAVA ECOSYSTEM

ABRAHAM VERGHESE, KC DEVARAJ URS

Abstract


A study was conducted in a guava (Psidium guajava L.) ecosystem in India to understand the spatial distribution and to develop a field sampling plan in case of the predator, Cryptolaemus montrouzieri Mulsant (Coleoptera:Coccinellidae). The predator had a varying spatial distribution; aggregated in 1990 and random the following year. However, there was no significant difference within a tree, among the four quadrants vrz., north, south, east and west. The number of trees to be sampled at 25% precision level was nine and four in 1990 and 1991, respectively, which is within a feasible limit under field situations. As there was no significant difference among quadrants, a whole tree may be sampled, by in situ canopy-scan method. From the study, for an orchard of 30 trees, nine are recommended for .sampling, which constitutes 30% of the orchard.


Keywords


Biological control;Cryptolaemus montrouzieri;guava;sampling;spatial dispersion

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