Answer: It is possible that there is a localized increase in a pest population since they can build up over time. This is especially true if you are not careful to rotate crops, clean up, remove and destroy infected plant debris and are slow to take action when a problem does occur. Sometimes too conditions are simply favorable for a particular problem. In general, healthy plants are better able to combat problems and it is also true that in some cases a pest problem may cause cosmetic damage rather than serious damage and can thus be tolerated. You might want to look into some IPM or Integrated Pest Management strategies and see if that will help overall.
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