One of the important characteristics elevating Heliothis spp. to major pest status is the ability to enter facultative diapause.

Most herbicides are complex molecules and their decomposition often requires several different chemical conversions, each mediated by a variety of organisms.

My objective has been to construct life tables describing Heliothis egg and larval survival on the major crops of the Darling Downs over several seasons.

The fungus Colletotrichum orbiculare(Berk. et Mont.) v. Arx (Walker and Nikandrow, unpublished data) was found causing anthracnose on X.

Biological control represents one alternative to insecticides. The Cotton Research Council (CRC) has funded a project to study native egg parasites of Heliothis.

As the first presentation on this topic I would like to very briefly outline the major advantages of producing an early crop.

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

It was once a commonly held belief in central Queensland that, because the potential cotton growing season was a long one, earliness was not an important management consideration.

BACILLUS THURINGIENSIS use as an insecticide for 25 years despite formidable competition from conventional insecticides is largely due to its safety and compatibility.

To the question "Can nutrition affect earliness?" the answer must be a definite Wes". Further, it will be just as important a factor as irrigation or pest management.

One such form is biological control, which relies on the use of natural pathogens and parasites to control the pest species.

From before the first seed is planted, everything that 1s done, 1.e. selection of seed variety, to all cultural practices and 1nsect control must have one aim and that is earliness.

The aim of the present work is to assess the usefulness of pteridines in determining the age of adults of P. scutigera.

Pest management is only one link in the cotton management chain. To produce an early crop it is essential that all links in that chain be securely welded together.

Cotton growers commonly apply nitrogen (N) fertilizer at rates of between 100 and 200 kg N/ha, yet the cotton plants seldom recover more than 40% of the applied N, and often much less.

To understand, and predict, Heliothis dynamics on cotton, along with changes in resistance levels, we must understand their dynamics on other hosts and the patterns of movement from these to cotton.

The CRC contracted Queensland Cotton and Siratac Ltd. to conduct a survey on the transfer of research information into the cotton industry.

SIRATAC users have the option early in the season of using standard thresholds or dynamic thresholds which vary between the standard level and an upper limit.

Conference Cover

The Siratac system when it was originally conceived had no database system included in the workings of the system.