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25% Citric
Acid Phytotoxicity Test
Observations 3 days after treatment
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Streptocarpus
Phytotoxicity rating: Severe
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All leaves turned black
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Flowers were bleached
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Recovery was slow
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Guava
Phytotoxicity rating: Moderate
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Eggplant
Phytotoxicity rating: Severe
- All leaves burned and dropped
- By 6 weeks after treatment, new leaves appeared
- Recovery was slow
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Leatherleaf fern
Phytotoxicity rating: Moderate
- Leaves burned on the outer edges, then dropped
- Recovery was moderate
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Calathea
Phytotoxicity rating: Severe
- Leaf coloration bleached out
- By 6 weeks after treatment, majority of leaves were
dead
- Recovery time was very slow
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Bromeliad
Phytotoxicity rating:
Moderate
- Tips of flowers and leaves burned
- Flowers were bleached
- Dark brown spots appeared where acid may have concentrated
- Recovery was slow
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Dendrobium orchid
Phytotoxicity rating: Moderate
- Mainly bleaching of flowers (spotty white, wilting
petals
- Recovery was moderate
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Anthurium
Phytotoxicity rating:
Moderate
- Flowers burned at edges
- Dark brown spots on older leaves
- Recovery was moderate
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Mock orange
Phytotoxicity rating:
Moderate
- Growing tips turned black
- Some leaves bleached, eventually discolored and
dropped
- Recovery was slow
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Passion fruit
Phytotoxicity rating: Slight
- Leaves were spotted white
- This plant is fastgrowing, so recovery was quick
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Sago palm
Phytotoxicity rating: Moderate
- Spotting on leaves, tips burned
- Recovery was slow
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Papaya
Phytotoxicity rating:
Slight
- Leaves were spotted, eventually turned brown and
dropped
- Lesions on trunks
- Recovery was slow
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