Rhododendron pestsappear most often during the growing season, causing numerous damage - spots and holes in the leaves, discoloration and distortion of rhododendron shoots and leaves. Somerhododendron pests , such as aphids, are very numerous in plants. How to deal with them and how to prevent the appearance of pests on rhododendrons? Here are effective methodsrhododendron pest control
Rhododendron pests - holes in leaves bitten by swollen mushrooms
Pests biting holes in leaves
Holes on the edges of the leavesas well as yellowing and drying of the bushes are a sign that the rhododendrons were attacked by the strawberry weevil beetle. Black adults, 8-11 mm long, damage rhododendron leaves in May and June. They forage at night and hide in the ground during the day. There, the females lay eggs, from which the larvae hatch, damaging the roots. Dillies can also attack other garden plants, but they especially like plants with fleshy leaves, such as rhododendrons.
After noticing damage to the leaves caused by the swelling, spray the plants (preferably in the late evening) with Fastac 100 EC (at a concentration of 0.02%). It is important to control the beetles before they lay their eggs, as controlling the larvae is difficult and often unsuccessful.
Yellow mosaic-like spotson the upper side of the rhododendron leaves and visible dark, tar-like feces underneath the leaves, is a sign that the plant has been attacked byblueberry x-rayThe eggs of this pest hibernate on the lower side of the leaves, where yellow-brown wingless larvae hatch at the turn of May and June.Adults with a reticular wing structure appear in July.
Spray the attacked plants with Decis 2.5 EC (at a concentration of 0.05%) or Sumi-alpha 050 EC (at a concentration of 0.04%). Usually the treatment has to be repeated.
Somerhododendron pestscause yellowing of leaves, which can easily be confused with symptoms of diseases of these plants. The sticky and yellowing leaves of rhododendrons may indicate that the plants have been attacked byRhododendron whiteflyAround the bushes in May and June, tiny white flies are visible - 1.2 mm long, light yellow insects with white wings. The females lay their eggs on the lower side of the leaves, where they also feed greenish-yellow larvae, which excrete large amounts of the so-called honeydew, on which fungi develop and form a black coating on the leaves.
After observing the whitefly in the period from June to July (during the flights of adults and for feeding of the larvae), the infested plants should be twice sprayed, at intervals of 14 days, with a contact preparation, eg Provado Plus AE.
Aphids on rhododendrons
In spring, large colonies on the youngest, developing rhododendron leaves formrhododendron aphidThe pest sucks sap from plants, strongly inhibiting the growth of young shoots and distorting the leaves. At the same time, it pollutes them with honey dew and numerous white exudates. Start the control of aphids immediately after detecting theserhododendron pestsThe bushes should be sprayed with an aphid preparation, e.g."Karate Zeon 050 CS (in a concentration of 0.02%). If you do not want to use chemicals in the garden, it is worth using the natural natural Agrocover preparation, and the prevention of aphids is prevented by potassium soap with the smell of garlic, which we can safely spray the plants with.
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