Answer:
01) Best methods:
Crop rotation
Companion planting
Intercropping
Cover cropping
Natural predators (e.g. ladybugs)
Biological pest control (e.g. using parasitic wasps)
Proper irrigation and soil management
Handpicking and removing of pests
Proper storage of harvested crops
02)Greatest infestation cause:
Monoculture (growing the same crop in the same area repeatedly)
Lack of crop rotation
Overuse of chemical pesticides
Poor soil health
Poor crop storage practices
Lack of natural predators in the environment.