EFFECT OF SUB -LETHAL DOSE OF SOME INSECT GROWTH INHIBITORS ON SOME PHYSICAL FEATURES OF WINGS CUTICLE OF AMERCINCA COCKROACH PERIPLANETA AMERICANA

Abstract

The results of treating the last nymphal instar of periplaneta americana by sub-lethal dose (o.1 ml of 0.2%) of Azadirachtin . Lufenuron and Methoxyfenozide . on some physical features of adults wings produced from treated nymphs. The results revealed asignificant variation in wings cuticle resistance to electrical current between treatment and control. The control treatment showed  a highest degree of electrical resistance in front and hind wings of  right and left direction and reached 157.89 . 170.89 . 134.33 . and 170.89 omh/m  respectively. The electrical resistance of wings cuticle in treatments were varied according to the kinds of insect growth in hibitors . The same treatment also exhibited a varied degree of wings absovption to ultra violet and infrared rays at different wave length according to the kind of  IGR and wave length in comparison with control treatment . these results confirmed that IGR changed the texture and components of the treated wings with IGR.