Pests & Diseases
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Cause
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Symptoms
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Treatment
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Aphids |
Leaves curled, distorted, small insects.
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Spray with Malathion, Rogor, Mavrik or Beat-a-Bug natural insecticide.
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Botrytis |
Brown spots and blotches. Fuzzy grey growth if conditions are
humid.
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Remove diseased and dead plant parts. Don't grow plants under
crowded and damp conditions where there is no air movements and
don't splash water on foliage.
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Mealybug |
White fluffy or waxy insects.
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Wipe off leaves where possible and treat with Malathion, Rogor
or Beat-a-Bug natural insecticide. Discard severly infested plants
as others nearby are likely to become infested as well.
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Mites |
Leaves yellow and stippled, may fall. Spider webbing may be present.
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Control with miticides or insecticides like Rogor or Mavrik.
Natural enemy: Ladybird
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Powdery Mildew |
Faint white spots that gradually enlarge to cover the whole leaf
and sometimes the stems.
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Control with fungicides such as Mancozeb Plus, Bayleton, Baycor
or Benlate.
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Scale Insects |
Reddish, grey or brown scaly bumps.
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Spray with White Oil. |
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Environmental
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Cause
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Symptoms
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Draughts |
Leaves yellow and fall. Leaves curl and fall. Brown tips or edges.
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Too cold |
Leaves curl, brown and fall.
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Too hot |
Spindly growth even in good light. Flowers are short lived. Lower
leaves wilt, brown and fall.
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Not enough humidity |
Leaf tips brown and shrivelled, edges yellow, buds and flowers
shrivel and fall.
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Not enough water
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Leaves curled and spotted, yellowing of lower leaves.
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Too much water
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Leaves become limp, possibly some soft areas, poor growth, leaves
curl, leaves yellow and wilt, tips may brown.
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Not enough light |
Leaves are smaller and paler than normal, turn yellow and fall.
Few or no flowers. Spindly growth, long spaces between leaves.
Variegated leaves turn green.
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Too much light
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Discolored or scorched leaves (usually due to direct sunlight).
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