›› 1999, Vol. 42 ›› Issue (4): 358-363.

• RESEARCH PAPERS • Previous Articles     Next Articles

CHANGES OF FEEDING BEHAVIOR AND MIDGUT PROTEASE ACTIVITIES OF LARVAL HELICOVERPA ARMIGERADURING THE FOURTH INSTAR

Li Wei,Wang Chen-zhu   

  • Online:1999-11-20 Published:1999-11-20

Abstract: Change patterns of feeding and midgut protease activities of larval Helicoverpa armigera during the fourth instar were investigated. It was shown that food amount eaten by the larvae and body weight gain of the larvae were low at the beginning and the end of instar and peaked at the middle of the instar. Activities of trypsin-like enzyme, chymotrypsin-like enzyme and total proteolysis showed concurrent change patterns with the feeding amount during the 4th instar. Larval ingestion exhibited continuous-feeding pattern, and feeding actions took about one sixth of the total time.

Key words: Helicoverpa armigera, feeding behavior, protease