Which of the following is not correct?

  1. A wide range of fungal, bacterial and viral pathogens affect the yield of cultivated crop species especially in tropical climates
  2. Crop losses can often be significant up to 20-30% or even 100%
  3. Hybrid breeding have led to the development of several high yielding varieties resistant to water stress
  4. The disease resistant varieties increase our dependence on use of fungicides and bacteriocides.
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