INVESTIGATIONS ON FRUIT BORER HELICOVERPA ARMIGERA (HUBNER) IN CHILLI
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Date
1999
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University of Agricultural Science, Dharwad
Abstract
"STUDIES WERE CARRIED OUT DURING 1995-98, AT THE DEPARTMENT OF AGRICULTURAL ENTOMOLOGY, UNIVERSITY OF AGRICULTURAL SCIENCES, DHARWAD. A FIELD SURVEY WAS CONDUCTED DURING 1995-97 AT DHARWAD AND BELGAUM DISTRICTS. IN DHARWAD DISTRICT, THE CHILLI FRUIT BORER HELICOVERPA ARMIGERA (HUBNER) DAMAGE WAS HIGHEST (35.91%) ON BYADAGI DABBI WITH 30.00 PER CENT OF WHITENING OF FMITS, COMPARED TO BELGAUM DISTRICT WHERE THE BORER DAMAGE WAS 13.32 PER CENT WITH 7.98 PER CENT OF WHITENING. BIOLOGY OF FRUIT BORER, H.ARMIGERA WAS STUDIED IN THE LABORATORY, THE INCUBATION PERIOD WAS 3.30 TO 4.50 DAYS, THE LARVAL PERIOD WAS 17 TO 13 DAYS AND THE PUPAL PERIOD WAS 9 TO 20 DAYS DURING DIFFERENT SEASONS OF THE YEAR. THE ECONOMIC INJURY LEVEL FOR H.ARMIGERA IN CHILLI WAS THREE LARVAE PER TWO PLANTS. EVALUATION OF DIFFERENT PESTICIDES AGAINST H.ARMIGERA IN CHILLI REVEALED THAT BORER DAMAGE WAS LEAST WITH CARBARYL (6.66%), FOLLOWED BY DIPEL (7.33%), ACHOOK (9.60%) AND NEEM SEED KERNAL EXTRACT (9.77%). SCREENING OF CHILLI GENOTYPES AGAINST IH.ARMIGERA INDICATED THAT THE GENOTYPES LIKE SL-37, ARKA LOHIT, PURI RED, DEWARHIPPARGI AND H.C.-28 WERE LESS SUSCEPTIBLE TO FRUIT BORER DAMAGE WHICH WERE FOUND PROMISING. MARIGOLD WAS IDEAL TRAP CROP IN THE MANAGEMENT OF FRUIT BORER IN CHILLI IN THE ROW PROPORTION OF 18:1 AND 20:1. SEQUENTIAL SPRAY OF ACHOOK, DIPEL AND CARBARYL WAS FOUND EFFECTIVE IN THE MANAGEMENT OF FRUIT
BORER WITH MARIGOLD AS TRAP CROP. IN VITRO STUDIES INDICATED THAT TRICHOGRAMMA CHILONIS ISHII PARASITIZED THE EGGS
LAID ON CHILLI FRUITS TO THE EXTENT OF 45.22 PER CENT. IN INTEGRATED PEST MANAGEMENT OF FMIT BORER, THE MODULE-1 WHICH COMPRISED OF 18:1 CHILLI : MARIGOLD PROPORTION AND SEQUENTIAL APPLICATION OF ACHOOK, DIPEL AND CARBARYL, RECORDED LESS EGG AND LAN/AL LOAD WITH LESS FMIT DAMAGE AND HIGHEST YIELD WITH A BENEFIT : COST RATIO OF 3.8:1 COMPARED TO OTHER MODULES. "
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No. of references 144