Wheat
Scout leaves and stems for rusts, mildew, smut symptoms and insect pressure.
Crop-wise field guides
Start with the crop, then narrow the problem by symptom, pest, disease, nutrient status and growth stage.
Rice
Monitor leaves, necks and panicles; pay attention to water management and disease-favouring weather.
Cotton
Regularly inspect the underside of leaves, terminal growth and fruiting structures for pests and disease symptoms.
Maize
Check lower and upper leaves for spots, blights, insect injury and nutrient-stress patterns.
Sugarcane
Inspect stalks, leaves and internodes; investigate uneven growth and red discoloration promptly.