1. How to observe the effect of Tianda 2116 on grapes?
To evaluate the impact of Tianda 2116 on grapevines, you can monitor several key indicators. First, check the leaves after bud break. If sprayed, the leaves should appear greener, thicker, and more uniform compared to non-sprayed ones. They should also be less prone to cold damage. Second, observe the fruit set. Sprayed vines should show more even and neat clusters, with longer stems and spikes, and a higher fruit setting rate. The panicle pedicels should be stronger, with fewer empty or damaged clusters. Third, assess the palisade tissue in the leaves. Sprayed plants typically have better-developed palisade cells, which enhance photosynthesis. Additionally, the grape clusters should look more uniform and attractive, with higher first-grade fruit rates and improved sugar content. Coloring should be more even, and overall yield should increase by over 20%. Lastly, check for pest and disease resistance. Sprayed vines should show fewer infestations, especially for downy mildew, and require less labor and cost for maintenance.
2. How to prevent grape white rot?
White rot, also known as botrytis, is a common fungal disease. To manage it, you can use fungicides like Fome 500 (diluted 500 times), chlorothalonil 75% (800 times), or mancozeb 80% (600 times). In July, applying these along with Tianda Silicone 3000-6000 times alternately can improve effectiveness and reduce labor time.
3. How to prevent grape black spot disease?
Black spot disease can be controlled by spraying a 3-5°Bé lime sulfur mixture before bud break. During flowering, mix 80% mancozeb at 600 times, 10% chlorothalonil at 3000 times, and Tianda 2116 fruit tree special type at 1000 times. Adding Tianda Silicone 3000-6000 times can help prevent black spot, anthracnose, and blight effectively.
4. How to prevent grape downy mildew?
Downy mildew can be managed alongside white rot and black spot. In the early stages, use 72% dimethomorph at 600 times or 58% metiram at 500 times, combined with Tianda Silicone 3000-6000 times. From July to August, apply a Bordeaux mixture (1:0.7:200) with Tianda Silicone 3000-6000 times for better results.
5. How to control grape longhorn beetles?
Grape longhorn beetles, also called tiger beetles, are most active 10–30 days after flowering. Apply 52.25% lambda-cyhalothrin at 1500 times or 2.5% imidacloprid at 2500 times to control them. For larvae in boreholes, inject 80% dichlorvos at 50 times into the holes with a syringe, then seal with clay.
6. How to deal with grape phylloxera?
Phylloxera infestations can be controlled by watering roots with 10% imidacloprid diluted 3000 times (1–2 liters per plant). Alternatively, apply 30% phoxim granules mixed with fine soil (6 kg/667 sq.m) around the roots, followed by watering during dry periods.
7. How to prevent grape leafhoppers?
Leafhoppers, also known as short-beaked aphids, can be controlled using a 3–5°Bé lime sulfur spray. For better results, combine it with 2.0% abamectin and Tianda Silicone 3000–6000 times.
8. How many times should Tianda 2116 be sprayed on grapes, and when?
According to field experience, Tianda 2116 should be applied four times. Use "Tianda 2116 fruit tree special type" at 1000 times, mixed with Tianda Silicone 3000–6000 times. Spray during bud break, leaf stage, 7–10 days before flowering, and 7 days after flowering. This not only boosts yield but also helps prevent white rot, black spot, and downy mildew.
9. How to prevent grape cracking?
Three weeks before harvest, ensure proper irrigation. Avoid bagging the vines and spray 2000 times calcium chloride or 600 times ammonium calcium, plus Tianda Silicone 3000–6000 times. You can also spray 100 times milk to reduce cracking and improve sweetness.
10. How to prevent grape brown spot?
Brown spot, or leaf spot, appears as dark lesions on leaves. Once detected, spray 25% propiconazole at 600 times. After controlling the lesions, use Bordeaux mixture with Tianda Silicone 3000–6000 times for better protection.
11. How to prevent grape root cancer?
Root cancer, or crown gall, is caused by bacteria. Prevention starts with planting disease-free seedlings. Soak them in 1% copper sulfate for 5 minutes, then in 50 times lime water for 1 minute. For infected plants, remove tumors and disinfect wounds with 50% thiobacillus at 100 times.
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