Abstract: As the results indicate, the developmental scale and speed of Stripe rust charges with different susceptability of wheat breeds. The epidemic curves on various wheat breeds arc best fitted by Gompertz model. According to the value of epidemic rate(k)in the model, the 8 breeds are classified into 3 susceptability levels,i.e. Highly(k≥0.1), medium(0.06<k<0.10)and least susceptable(k≤0.06). Approaches concerning the prevention of Stripe rust epidemics in susceptable areas of southern Gansu province are discussed in the paper.

Key words: Bemisia tabaci, pesticide resistance monitoring, biotype, host plant, temperature