Havamsu
GARDEN / A VISUAL GUIDE
Practical growing ideas for the space you have.
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Hold white paper under a leaf and tap sharply. Moving specks that smear greenish-yellow are pest spider mites. Orange or reddish streaks identify beneficial predatory mites worth protecting.
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Twospotted spider mites pierce cell walls on leaf undersides, extracting chlorophyll. This creates pale sand-like speckling across the upper foliage, distinct from uniform yellowing caused by nitrogen shortages.
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Direct a firm spray of water at leaf undersides to dislodge nymphs, destroy webs, and raise humidity. This physical intervention helps slow mite reproduction accelerated by hot, dry urban balconies.
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If pests persist, apply insecticidal soap or horticultural oil during early morning or evening. Repeat in 5 to 10 days to intercept newly hatched eggs, avoiding applications in direct sunlight above 90°F.
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Skip synthetic pyrethroids like bifenthrin or permethrin. Spider mites frequently resist them, and these chemicals eliminate natural predators like minute pirate bugs and lacewing larvae, causing population flare-ups.
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When dense webbing covers growing tips and leaves turn brittle, recovery is unlikely. Slide a bag over the entire plant before cutting the stem to prevent pests from ballooning onto nearby crops.
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