The frequency of resistance to synthetic pyrethroids in Heliothis armigera has been monitored in the Namoi Valley since the introduction of the insecticide resistance management strategy in 1983.

Chemical Farming implies the use of chemicals for the control of insects, weeds and diseases.

The study reported here concentrated. On these sap-suokinq bugs, which were reputed to damage seedling and early-squaring cotton

Currently in Australia there are approximately 700 cotton germplasm accessions located with CSIRO, QDPI and a few private seed companies.

Host Plant resistance is one such method and has been adopted in developing plant resistance to a range of plant problems. Plants posses both natural physiological and chemical defence mechanisms.