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Adult weevils generally feed on foliage. Leaves or flowers appear notched or ragged like yours. The most serious damage is done by larvae, which feed on roots and can kill or weaken some plants, especially azalea and rhododendron. For rhododendrons, plant less-susceptible species.Click to see full answer. Hereof, what to spray on rhododendrons for bugs?For adult lace bugs, recommended spray insecticides include acephate, bifenthrin, lambda cyhalothrin, malathion, and cyfluthrin. Acephate may give the best control, as this insecticide is a foliar systemic that will move through the leaves to kill the lace bugs on the undersides of the leaves.Similarly, how do you keep deer from eating rhododendrons? The most effective deer deterrent is a fence—but it must be at least 8 feet tall, or else the deer will jump right over, as you’ve experienced. Alternatively, you could try draping deer netting over your rhododendrons next fall. Remove it in spring before the shrubs begin to bloom. Also question is, what is the best fertilizer for rhododendrons? Liquid or water-soluble fertilizer is mixed with water and then poured into the soil. If you are concerned about cost, granular fertilizer is the best fertilizer for rhododendrons since it is the cheapest. Liquid fertilizer passes quickly through the soil and application must be repeated more frequently.What’s wrong with my rhododendron?Few diseases of rhododendrons are also prevalent. These include: Chlorosis – Chlorosis, an iron deficiency, is common in rhododendrons and causes leaves to turn from a rich dark green to a light green or even yellow. Fungal dieback – Many different fungi cause a disease known as dieback.

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