4. Resistance抗性 Disease resistance抗病性 Pest insect resistance抗虫性 Stress resistance or tolerance Figure 8. Heavy infection of stem rust on triticale. Note hat leaf blades and sheaths are also affected (drought, coldness, freeze, salinity, alkalinity) Figure 9. Uredia of P. graminis. Note the loose epiderma2021/2/21 8 4. Resistance 抗性 • Disease Resistance 抗病性 • Pest insect Resistance 抗虫性 • Stress Resistance or Tolerance (drought, coldness, freeze, salinity, alkalinity)