EFFECT OF TRIFLUMURON AND DIAFENTHURON ON THE HAEMOCYTES OF AMERICAN BOLLWORM, HELICOVERPA ARMIGERA (LEPIDOPTERA: NOCTUIDAE)

The effect of triflumuron and diafenthuron (lc_40 , lc_50 , lc_60 ) on total and differential haemocyte was evaluated on 3rd and 5th instar larvae of helicoverpa armigera. the total haemocyte count just after the application of lc_50 of triflumuron in 3rd instar larvae increased (78900cells/mm3), while decreased (83800 cells/mm3) after half an hour, and increased again (90200 cells/mm3) after one hour of application from the normal count (68175 cells/mm^3). the percentage of prohaemocytes decreased from normal (42% to 26%), whereas the percentage of plasmatocytes, spherulocytes, cystocytes, and granulocytes increased from normal (18%, 29%, 2.75% and 8.25% to 29%, 32%, 4% and 10% respectively after the application of insecticide. similar results were recorded with 5th instar larvae. the total haemocyte count just after the application of lc of diafenthuron in 3rd instar larvae 50 increased (82400 cells/mm^3) from the normal count, while decreased (79900 cells/mm^3) after half an hour, and increased again (84300 cells/mm^3) after one hour of application from the normal count (68175 cells/mm^3). the differential haemocyte count, plasmatocytes, spherulocytes, cystocytes, and granulocytes increased from normal (18%, 29%, 2.75% and 8.25% to 24%, 30%, 3% and 9% respectively), whereas the percentage of prohaemocytes, decreased from normal (42%, to 34% respectively) after the application of insecticide in 3rd instar larvae .