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Title

COMPARATIVE LIFE HISTORY OF WOOLLY POPLAR APHID, PHLOEOMYZUS PASSERINII, ON VARIOUS POPLAR CLONES

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Abstract

 THE LIFE TABLE PARAMETERS OF WOOLLY POPLAR APHID (PHLOEOMYZUS PASSERINII SIGN. (HOM: APHIDIDAE)) AS AN IMPORTANT PEST OF POPLARS (POPULUS SPP.) WERE STUDIED DURING 2002-3. IN THIS REGARDS, POPLAR CUTS BELONGING TO FOUR SPECIES NAMELY, POPULUS ALBA, P. DELTOIDS, P. NIGRA AND P. C. EURAMERICANA WERE INFESTED WITH A NEWBORN APHID (<24H.) AND THEIR REPRODUCTIVE PROCESS WERE RECORDED IN A CONTROLLED CONDITION, 21±1 CELSIUS, 60-70% RH AND PHOTOPRIOD OF 16:8 (L:D). SUBSEQUENTLY, THE EXPERIMENT WAS CARRIED OUT WITH 18 REPLICATIONS AND THE APHID FECUNDITY AND DEATH RATE WAS RECORDED UNTIL THE END OF LIFETIME. THEREAFTER, LIFE TABLE PARAMETERS WERE CALCULATED ON EACH CLONE. THE MOST BASIC LIFE TABLE PARAMETERS WERE AGE X, SURVIVING FROM BIRTH TO EXACT AGES X (LX) USING THIS FACTORS FOR CALCULATION OF LIFE TABLE PARAMETERS SUCH AS NUMBER OF SURVIVORS FOR SUCCESSIVE X AND X+1 DX, AGE SPECIFIC MORTALITY QX, AND LIFE EXPECTANCY EX AND THE CURVES WERE PREPARED. THE APHIDS ON NUMBER OF CLONES INCLUDING, P. ALBA58/57, P. DELTOIDS 72/51 AND P.X. EURAMERICANA 214 COULD NOT BE ABLE TO REPRODUCE, SHOWING THE IMMUNE RESPONSE IN THESE CLONES. THE RESULTS REVEALED THAT SURVIVING FROM BIRTH TO EXACT AGES X (LX) BEGAN AT 13TH DAY AND REACHED TO ZERO AT 21TH DAY, ALSO AGE SPECIFIC MORTALITY (QX) BEGAN AT 15ND DAY AND REACHED HIGHEST AT 19TH DAY ON SUSCEPTIVE CLONE (P. NIGRA 56/72). LIFE EXPECTANCY (EX) WAS 19.50 AT THE INITIATION OF DEVELOPMENT WICH REDUCED TO ZERO AT 24TH DAYS. SURVIVING FROM BIRTH TO EXACT AGES X (LX) WERE HIGHEST AT THE P. NIGRA 56/72 (13) AND LOWEST (1) IN P. NIGRA 62/149. ALSO LIFE EXPECTANCY (EX) WAS HIGHEST (19.50) IN P. NIGRA 56/72 AND LOWEST (12.50) IN P. DELTOIDES MISSORIENSIS. THE RESULT REVEALED THAT THERE WERE DIFFERENCES BETWEEN PARAMETES OF LIFE TABLE IN APHIDS ON VARIOUS POPLAR CLONES.

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