Protect leylandii from conifer mite
Protect Leylandii from Conifer Mite and Cypress Aphid
Love them or hate them, leylandii are now a common sight in the towns and suburbs of the British Isles. When grown responsibly, they can provide rapid and inexpensive privacy screening. However, recent years has seen a challenge to this plant with the rise of two insect pests. Signs of damage include brown conifers or brown patches in your conifers.
1. Conifer Mites (Oligonychus ununguis (Jacobi))
Spider mites are hosted by a variety of tree and plantings including spruce, fir, juniper, pine, hemlock and others. Infested trees display mottled foliage which may appear brownish-grey, and needle loss may occur.
To confirm a mite infection, lightly tap the damaged branches over a white paper and examining the paper for reddish-brown mites which are about the size of pepper grains. In heavy infestations, spider webbing may also be conspicuous.
2. Cypress aphids (Cinara cupressivora)
Damage caused by cypress aphid develops in late spring and summer. It is found most often at the base of the hedge, but can develop at any height. Large greyish greenfly are sometimes found, but the hedge browning often develops long after the aphids have left the foliage. Clues are left behind, including cast aphid skins and a black fungal growth (sooty mould) that grows on the sugary honeydew excreted by the pest.
How to control conifer mite / cypress aphid
Provided the damage can be spotted early, before the tree/plants have taken too much damage, both pests can be treated with one product solution. “Certis Spraying Oil” is a highly refined mineral oil emulsion, designed to dilute with water and spray onto affected plants.
Spraying Oil works on red spider mites by both blocking their breathing pores and by making the leaf surfaces inhospitable to migrating mites. Scale insects and mealy bugs cannot tolerate the penetrating solvent and surfactant properties of Spraying Oil and they will not attach themselves to, or invade treated leaf surfaces.
Treatment should commence in spring at the first sign of leaf browning and be repeated every 4-6 weeks through summer and autumn.
Application Rate: 1 part Spraying Oil to 100 parts of water. On young plants with tender foliage use 1 part Spraying Oil to 200 parts water. Spray foliage until well wetted. Always read the label.
For more information on Spraying Oil click here or call freephone 0800 032 6262.
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