Many exotic pests and diseases have been introduced into the country since time immemorial before which quarantine of any sort existed. However a strict quarantine regime is in place today to prevent against the inadvertent entry of any plant pest or pathogen into the country for which the DPPQS headquartered in faridabad is the nodal agency.
Some examples of major pests that notoriously came into the country from another along with year of incidence are given below:
| Sl.No | Pests | Host | Source /Country | Year |
|---|---|---|---|---|
| 1. | American Serpentine Leaf Miner (Liriomyza trifolii) | Chrysanthemum | America | - |
| 2. | San Jose Scale (Quadraspidiotus perniciosus) | Wild and cultivated plants | Australia | 1910 |
| 3. | Coffee berry borer (Hypothenemus hampeii) | Coffee | Sri Lanka | 1990 |
| 4. | Giant African Snail (Achatina fulica) | Vegetables | East Africa | 1847 |
| 5. | Fluted scale (Icerya purchase) | Acacia sp. | Sri Lanka | 1912 |
| 6. | Wooly Aphid (Eriosoma lanigerum) | Apple | - | - |
| 7. | Codling moth (Cydia pomonella) | Apple | Not known | 1919 |
| 8. | Spiralling whitefly (Aleurodicus isperses) | Fruit crops | Sri Lanka/Maldives | 1993 |
| 9. | Eriophyid mite (Aceria guerreronis) | Coconut | Sri Lanka | 1995 |
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