How to dilute Fitoverm for spider mite to treat cucumbers in an open field? - briefly
Mix 1 ml of Fitoverm into 10 L of water to achieve a 0.01 % (v/v) solution and spray cucumber leaves thoroughly until runoff.
How to dilute Fitoverm for spider mite to treat cucumbers in an open field? - in detail
Fitoverm must be mixed at the label‑specified concentration to achieve effective spider‑mite control on cucumbers grown outdoors. The product contains the active ingredient spinosad, which requires precise dilution for optimal uptake and minimal phytotoxicity.
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Determine the target concentration. For field cucumber crops, the recommended rate is 0.5 mL of Fitoverm per 10 L of water, delivering approximately 25 ppm of spinosad. Adjust the volume proportionally if larger spray tanks are used.
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Measure the product accurately with a calibrated syringe or graduated cylinder. Avoid estimating by eye; a 0.5 mL error can cause sub‑lethal dosing or leaf burn.
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Fill the spray tank with the desired amount of clean water, preferably at ambient temperature (15‑25 °C). Add the measured Fitoverm, then agitate gently for 30 seconds to ensure uniform distribution. Do not introduce air bubbles, which can cause foaming and uneven coverage.
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Apply the solution using a low‑pressure sprayer that produces droplets of 200‑300 µm. Direct the spray onto the undersides of leaves where spider mites reside. Coverage should be thorough but avoid runoff that can reach the soil surface.
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Schedule applications at 7‑day intervals, beginning when the first mite colonies are detected. Repeat treatments for three consecutive applications, extending the interval to 10 days if environmental conditions (high temperature, low humidity) reduce mite activity.
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Observe pre‑harvest intervals. Harvest should occur at least 3 days after the final spray to comply with residue limits.
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Safety measures: wear chemical‑resistant gloves, goggles, and a disposable coverall. Rinse all equipment with water after use and store any remaining Fitoverm in a sealed container away from sunlight.
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Environmental precautions: avoid spraying during windy conditions (>10 km/h) to prevent drift onto non‑target plants. Do not apply when bees are actively foraging; a 2‑hour buffer after sunrise reduces pollinator exposure.
Following these steps ensures the correct dilution, application, and timing of Fitoverm for controlling spider mites on cucumbers cultivated in open fields.