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Information Seminar Paper

Title

REPRODUCTIVE PARAMETERS OF TETRANYCHUS URTICAE (ACARI: TETRANYCHIDAE) ON THREE LEGUMINOUS PLANTS

Pages

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Abstract

 THE TWO SPOTTED SPIDER MITE, TETRANYCHUS URTICAE KOCH (ACARI: TETRANYCHIDAE) HAS A BROAD RANGE OF HOST PLANTS INCLUDING FIELD CROPS, GREENHOUSE CROPS, ORNAMENTALS AND FRUIT TREES. HOWEVER, THE SPIDER MITE DOES NOT ACCEPT ALL PLANTS TO THE SAME DEGREE BECAUSE OF DIFFERENCES IN NUTRITIVE AND TOXIC CONSTITUENTS. IN THIS STUDY, POPULATION GROWTH PARAMETERS OF THIS MITE WERE STUDIED ON COMMON BEAN (PHASEOLUS VULGARIS), VETCH (VICIA ERVILIA) AND SOYBEAN (GLYCINE MAX) UNDER LABORATORY CONDITION (25±1°C, 65±5% R.H. AND A PHOTOPERIOD OF 16 L: 8 D HOURS). FOR THIS, A COHORT OF 100 EGGS OF THE MITE WAS SEPARATELY PLACED ON THE LEAVES OF EACH PLANT IN PETRI DISH. AS SOON AS ADULT MITE EMERGED, MALE AND FEMALE MITES WERE COUPLED ON EACH PLANT AND DAILY OVIPOSITION RATE OF FEMALES WAS RECORDED UNTIL DEATH. REPRODUCTIVE PARAMETERS WERE CALCULATED AS CAREY AND STANDARD ERROR OF THE PARAMETERS WAS ESTIMATED USING JACKKNIFE PROCEDURE. THE HIGHEST AND LOWEST VALUE OF GENERATION TIME WAS 13.53 AND 11.93 DAYS ON SOYBEAN AND BEAN, RESPECTIVELY. ALSO, THE NET REPRODUCTIVE RATE WAS THE HIGHEST ON BEAN 7.34 FEMALE/FEMALE/GENERATION AND THE LOWEST ON VETCH 4.02FEMALE/FEMALE/GENERATION. FURTHERMORE, INTRINSIC RATE OF NATURAL INCREASE ON BEAN, VETCH AND SOYBEAN WAS 0.16, 0.11 AND 0.13FEMALE/FEMALE/DAY, RESPECTIVELY. COMPARISON OF THE REPRODUCTIVE PARAMETERS OF THE T. URTICAE ON THESE THREE HOST PLANTS REVEALED THAT BEAN WAS THE MOST SUSCEPTIBLE HOST PLANT TO THIS PEST.

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