How to prepare phytoverm for treating eggplants against spider mites in a greenhouse? - briefly
Mix 30 ml of phytoverm concentrate with 10 L of water, stir, and spray onto eggplant foliage in the greenhouse until runoff, repeating every 7‑10 days during infestation. Ensure complete coverage of leaf undersides and apply in the early morning or late afternoon to minimize phytotoxic risk.
How to prepare phytoverm for treating eggplants against spider mites in a greenhouse? - in detail
Prepare a phytoverm solution specifically for eggplant spider‑mite management in a greenhouse by following these precise steps.
Measure the active product. Use a commercial formulation of phytoverm containing the active ingredient Bacillus thuringiensis var. kurstaki. Follow the label recommendation of 5 g of dry powder per 10 L of water for a standard concentration; adjust to 7 g per 10 L if the infestation is severe.
Dissolve the powder. Add the measured amount to a clean container of warm (30‑35 °C) water. Stir continuously for 2–3 minutes until the granules are fully dispersed. Do not add any surfactants unless the label explicitly permits, as they may reduce efficacy.
Filter the mixture. Pass the solution through a fine mesh (≤0.5 mm) to remove undissolved particles that could clog spray nozzles.
Calibrate the sprayer. Set a hand‑held or pump‑type sprayer to deliver 200 mL m⁻². Verify the flow rate by dispensing a known volume over a measured time interval.
Apply during optimal conditions. Conduct the first spray early in the morning or late afternoon when leaf temperature is below 28 °C and relative humidity exceeds 70 %. This promotes uptake by the mite population and minimizes photodegradation of the biopesticide.
Cover all foliage. Ensure thorough wetting of both leaf surfaces and the undersides where spider mites reside. Repeat the application every 5–7 days until the population drops below economic threshold (≈3 mites per leaf).
Observe safety precautions. Wear gloves, goggles, and a mask while handling the product. Keep the solution out of reach of personnel and non‑target organisms. Store any remaining concentrate in a cool, dark place, sealed tightly.
Record observations. After each treatment, note mite counts, plant vigor, and any phytotoxic symptoms. Adjust dosage or interval based on the recorded data to maintain control while preserving plant health.