MICROBIAL CONTROL OF LEPIDOPTEROUS LARVAE

A BIOASSAY TECHNIQUE WAS DEVELOPED FOR TESTING THE EFFECTIVENESS OF FIVE COMMERCIAL FORMULATIONS OF THE MICROBIAL CONTROL AGENT BACILLUS THURINGIENSIS AGAINST LARVAE OF THE RED-HUMPED CATERPILLAR, SCHIZURA CONCINNA. THE RESULTS, TOGETHER WITH THE RESULTS OF FIELD PERSISTENCE AND PHYTOTOXICITY TRAIL, INDICATED THAT CERTAIN FORMULATIONS COULD PROVIDE THE DEGREE OF CONTROL REQUIRED AT A COST COMPARABLE TO, OR LOWER THAN, THE COST OF CHEMICAL INSECTICIDES FORMERLY USED. A SERIES OF FIELD TRIALS, CONDUCTED UNDER NORMAL PEST CONTROL OPERATING CONDITIONS, CONFIRMED THE LABORATORY FINDINGS, AND IT IS RECOMMENDED THAT BACILLUS THURINGIENSIS BE ADOPTED AS THE CONTROL AGENT FOR THIS PEST. DETAILED POPULATION STUDIES OF THE PEST INSECT REVEALED TWO IMPORTANT NATURAL ENEMIES, HYPOSOTER FUGITUVUS AND APANTELES SP., BOTH PARASITIC WASPS. THE DECLINE OF NATURAL CONTROL BY H. FUGITIVUS APPEARED TO BE DUE TO A DRASTIC REDUCTION IN NECTAR SUPPLY DURING THE LATE SUMMER. THE POSSIBLE ENHANCEMENT OF THE HIGHWAY LANDSCAPE TO FAVOR THESE BENEFICIAL INSECTS IS DISCUSSED. THE ADULT MOTHS OF SCHIZURA CONCINNA ARE NOCTURAL, SO THAT DIRECT OBSERVATION OF THEIR FLIGHT ACTIVITY IS NOT POSSIBLE. TWO METHODS WERE USED IN AN ATTEMPT TO DETECT MAJOR FLIGHT PERIODS AND SO PROVIDE ADVANCE INFORMATION ON DEVELOPING INFESTATIONS. THE FIRST METHOD EMPLOYED AN ULTRA-VIOLET (BLACK-LIGHT) TRAP. THIS WAS UNSUCCESSFUL, PROBABLY DUE TO THE LARGE NUMBERS OF STREET LIGHTS NEAR BY. THE SECOND METHOD INVOLVED THE USE OF VIRGIN FEMALE MOTHS IN PHEROMONE TRAPS. THE RESULTS OF THIS METHOD WERE ENCOURAGING, BUT AN IMPROVED TRAP DESIGN IS NECESSARY TO PROLONG THE LIFE OF THE ENCLOSED MOTHS./FHWA/

  • Corporate Authors:

    University of California, Berkeley

    Berkeley, CA  USA  94720

    California Division of Highways

    Bridge Department
    Sacramento, CA  USA  05914

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  USA  20590
  • Authors:
    • Pinnock, D E
  • Publication Date: 1971-1-28

Subject/Index Terms

Filing Info

  • Accession Number: 00204636
  • Record Type: Publication
  • Source Agency: Federal Highway Administration
  • Report/Paper Numbers: G-2-2
  • Files: TRIS, USDOT
  • Created Date: Apr 1 1971 12:00AM