When the celery spotted disease occurred, the lesions were contiguous and the leaves were dry. The petiole develops a fusiform or stripe-like lesion, grayish-brown, slightly sag, and when the humidity is high, a gray mold layer appears, and the petiole is severely broken. The reason is that greenhouse cultivation celery, due to the large temperature difference between day and night, a long time condensation, easy to disease. In addition, weak plants are also susceptible to disease.
Control techniques.
1 For more than 2 years of rotation, shade seedlings should be shaded in summer, be close-packed, and diseased plants removed as soon as possible. 2 Use disease-free seeds and soak in warm water at 48°C for 30 minutes. 3 Strengthen fertilizer and water management, timely ventilation, and control air humidity. 4 At the beginning of the disease, spray 50% carbendazim WP 500 times, or 50% acetaminophen wettable powder 1300 to 1500 times, or 70% dexamethasone WP 400 to 500 times, or 77% can kill 500 times the wettable microparticles, or 80% of the wettable powder 800 times spray. 5 with 10% chlorothalonil smoke agent 200 ~ 250 grams of smoke control. 6 Use 5% chlorothalonil dust to spray 1000-1100 grams per 667 square meters.
Hearing aid manufacturers strive to optimize their wireless hearing aid offerings both in terms of connection reliability as well as power efficiency. Variance across patients and listening conditions can make optimizing wireless hearing aid systems a complex process.
Factors such as connection distance, proximity of reflective surfaces, interference from other wireless devices, and energy loss through body absorption must all be factored into the hearing aid design. For example, indoor wireless performance may be very different from wireless performance experienced outdoors, where the only reflective surface may be the ground on which the hearing aid user is standing. Furthermore, individual differences in body geometry increase the variability that wireless engineers must account for when designing a system that provides each user with a consistent and reliable experience.
As awareness of wireless hearing technology grows, hearing healthcare professionals may notice an uptick in long-term safety concerns. Consumers should be confident knowing that wireless hearing aids are safe and strictly regulated medical devices that meet governmental wireless communication standards in addition to those set forth for medical devices.
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