What are the common pesticides for orchids? A detailed guide to their targets and effects

 1. Zineb 80% WP

    Target pests/diseases: anthracnose, leaf spot.
  
    Mode of action: contact, preventive.
  
    How to use: spray at the early stage of disease.
    2. Mancozeb 70% WP
    Target pests/diseases: anthracnose, leaf spot, blight.
    Mode of action: broad-spectrum antibacterial.

    How to use: spray.
    3. Chlorothalonil 75% WP:
    Target pests/diseases: leaf spot, blight, anthracnose.
    Mode of action: broad-spectrum, non-systemic.
    How to use: preventive application before disease onset.
    4. Sandofan (oxadixyl + mancozeb) 64% WP
    Target pests/diseases: rot disease.
    Mode of action: contact, systemic, prone to resistance.
    How to use: spray.
    5. Ridomil MZ (metalaxyl + mancozeb) 58% WP
    Target pests/diseases: blight, root rot.
    Mode of action: systemic, may leave spray marks.
    How to use: spray, drench the roots.
    6. Polyoxin 10% WP
    Target pests/diseases: various leaf spot diseases.
    Mode of action: systemic, safe.
    How to use: spray.
    7. Score (difenoconazole) 10% WP
    Target pests/diseases: leaf spot, anthracnose.
    Mode of action: systemic.
    How to use: spray.
    8. Fosetyl-aluminium 80% WP
    Target pests/diseases: blight, downy mildew.
    Mode of action: systemic, translocated upward and downward.
    How to use: spray, root drench.
    9. Sporgon (prochloraz) 25% WP
    Target pests/diseases: anthracnose, blight, leaf blight.
    Mode of action: broad-spectrum, suppresses certain soil fungi.
    How to use: spray.
    10. Thiophanate-methyl 70% WP
    Target pests/diseases: various leaf spot diseases, flower rot, anthracnose.
    Mode of action: broad-spectrum, antibacterial.
    How to use: spray.
    11. Carbendazim 50% WP
    Target pests/diseases: leaf blight, anthracnose, root rot.
    Mode of action: systemic.
    How to use: spray.
    12. Kocide (copper hydroxide) 77% WP
    Target pests/diseases: blight, root disease, leaf spot.
    Mode of action: broad-spectrum and long-lasting; watch out for phytotoxicity.
    How to use: spray, root drench.
    13. Dexon (fenaminosulf) 75% WP
    Target pests/diseases: root disease, stem rot, anthracnose.
    Mode of action: systemic, penetrating.
    How to use: soil treatment.
    14. Previcur 66.5%
    Target pests/diseases: blight, pythium rot.
    Mode of action: inhibits fungi, stimulates plant growth.
    How to use: spray, soil treatment.
    15. Zhibingling 1.5% emulsion
    Target pests/diseases: viral diseases.
    Mode of action: inhibits viruses, promotes plant growth.
    How to use: spray
    16. Weixiuling 20% emulsifiable concentrate
    Target pests/diseases: rust disease.
    Mode of action: systemic.
    How to use: spray.
    For the dilution rates of the above sixteen pesticides, please refer to the product instructions.