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Indian Journal of Agricultural Research, volume 36 issue 2 (june 2002) : 133" 136

DIS1RIBUTION PATIERN OF CITRUS BlACKFLY (ALEUROCANFHUS WOGLUM!ASHBY) INFESTING MANDARIN ORANGE IN DARJEELING DISTRICT OF WESTBENGAL

Hirak Chatterjee

Affiliations

¹Department of Agricu1tural Entomology, U~r Banga Krishi Vlsh~vidyalaya, Pundibari, Coochbehar - 736i65, India

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Cite article:- Chatterjee Hirak (2025). DIS1RIBUTION PATIERN OF CITRUS BlACKFLY (ALEUROCANFHUS WOGLUM!ASHBY) INFESTING MANDARIN ORANGE IN DARJEELING DISTRICT OF WESTBENGAL. Indian Journal of Agricultural Research. 36(2): 133" 136. doi: .

ABSTRACT

Distribution pattern of citrus blackfly (Aleurocanthus woglumi Ashby) was studied on mandarin orange (Citrus reticulala Blanco) at Darjeeling district of West Bengal during 1997–1998. Different indices of dispersion i.e variance mean ratio, dispersion Parameter ‘K’, David and Moore's index, Charlier coefficient and Lioyd patchiness index showed aggregative, clumped and contagious nature of distribution of citrus blackfly adult in all the successive flushes viz., Ambia (spring) Mrig(summer) and Hasta (autumn) flushes during a year. However, calculated ‘K’ values of most of the standard weeks observed to be slightly deviated from the negative binomial aggregative type of distribution.

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REFERENCES

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DIS1RIBUTION PATIERN OF CITRUS BlACKFLY (ALEUROCANFHUS WOGLUM!ASHBY) INFESTING MANDARIN ORANGE IN DARJEELING DISTRICT OF WESTBENGAL

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