How should I properly dilute Fitoverm for spraying cucumbers against spider mite in a greenhouse? - briefly
Use a 1 ml : 1 L water ratio (approximately 0.1 % v/v) of Fitoverm, add a few drops of non‑ionic surfactant, and spray thoroughly onto both sides of cucumber leaves until runoff in the greenhouse environment.
How should I properly dilute Fitoverm for spraying cucumbers against spider mite in a greenhouse? - in detail
Fitoverm is a sulfur‑based contact acaricide; correct dilution ensures effective control of Tetranychus urticae on cucumber vines while minimizing phytotoxicity.
Begin with the product label. The recommended rate for cucumber in a protected environment is typically 2–3 g of active ingredient per 100 L of water, which translates to 0.02–0.03 % w/v. Verify the exact concentration for the specific formulation (granular, liquid concentrate, or water‑soluble powder) and adjust for any label‑stated maximum or minimum limits.
Mixing procedure
- Measure the required amount of Fitoverm with a calibrated scale. For a 200‑L spray tank, use 4–6 g of the product if the label specifies 2 g / 100 L.
- Fill the tank with approximately one‑third of the total water volume. Use clean, lukewarm water (20–25 °C) to promote rapid dissolution.
- Add the measured Fitoverm slowly while stirring continuously. Avoid splashing; a mechanical agitator or hand‑held stirrer is sufficient.
- Complete the water fill to the final volume, then mix for an additional 2–3 minutes to ensure homogeneity.
- Conduct a spot test on a single leaf before full‑area application. Apply a few drops of the diluted solution to the underside of a leaf, wait 24 h, and observe for any discoloration or necrosis. If symptoms appear, increase the dilution ratio by 10 % and repeat the test.
Application parameters
- Spray during the early morning or late afternoon when leaf temperature is below 30 °C and relative humidity exceeds 70 %. These conditions favor leaf retention of the spray and reduce volatilization of sulfur.
- Use a fine‑mist nozzle (200–300 µm droplet size) to achieve thorough coverage of leaf undersides where spider mites congregate.
- Calibrate the sprayer to deliver 200–250 L ha⁻¹, matching the volume used in the mixing calculation.
- Re‑apply at 7‑day intervals until the mite population falls below economic thresholds, typically after 2–3 applications.
Safety and compatibility
- Wear protective gloves, goggles, and a respirator mask rated for particulate matter when handling the product.
- Do not mix Fitoverm with copper‑based fungicides or oil‑based adjuvants unless the label explicitly permits; incompatibility can cause precipitation and loss of efficacy.
- Store the concentrate in a cool, dry place, away from direct sunlight and sources of ignition.
Record‑keeping
- Log each application date, tank mix concentration, volume applied, and environmental conditions. This documentation supports compliance with integrated pest‑management protocols and facilitates adjustments for future cycles.
Following these steps yields a precise 0.02–0.03 % solution, optimal coverage, and reliable control of spider mite infestations on greenhouse‑grown cucumbers.