Pests:
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1. Citrus leaf miner. Serious pest in all species. Larvae mine the leaves resulting curling. Spray Monocrotophos (0.03%) weekly during flush.
2. Lemon Butterfly. Larvae feed on leaves. Fruit drops. Dusting of BHC (5 %) or spraying carbaryl (0.1%).
3. Fruit sucking moth – Suck juice from fruit, fruit drops. unmarketable. Spray monocrotophos (0.03%).

Diseases:
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1. Citrus canker. Bacterial. Wide spread in India. Serious in Acid lime. Leaves, twigs, fruit & thorns affected. Fruits of poor quality. Controlled by pruning & burning, diseased parts. Spray Bordeaux Mixture (10:5:100) to new flushes. Spray 500 ppm streptomycin sulphate.
2.Greening :- Caused by mycoplasma. Chlorosis of leaves, thickening of leaf, shortening of internodes, off season blooming. & die back. Fruits small. Spread by vector Citrus psylla. Controlled by removing infected trees. Control Citrus psylla by pesticide.
3. Phytophthora Rot (Root rot, collar rot, crown rot, gummosis, etc.) fungal. Most serious, soil inhabitant. Controlled by raising nursery in disease free condition, avoid water logging, paste bordeaux paste 60 cm on the trunk. Use tolerant root stocks like Sour Orange, Trifoliate Orange, etc. Apply qurofunsin (1 g in 10 lit water)
Citrusdecline:- Throughout the world. Complex problem.

Factors-responsible for citrus decline:
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1. High soil pH 5. Nematodes
2. Insect pest & diseases 6. Nutritional
3. Greening diseases 7. Soil management.
4. Judicious intercropping 8. Lack of plant protection.