Apple grass aphid is the most common aphid species on apple but it only causes minor damage to commonly grown apple varieties. Some apple varieties are more sensitive e.g. Jonathan. The life cycle involves two hosts. Apple, pear and quince are the …
Determining harvest intervals for zero residues Zero residues management system (ZRMS) Zero residues management Starting out with minimal residues production …
Life cycle Recognition Monitoring Cultural and biological control Further reading …
Overwintered eggs on the bark of apple trees hatch in spring by the green cluster growth stage. The nymphs feed on the undersides of the rosette leaves and amongst the flower buds sometimes invading the flowers during bloom. The first generation is …
Egg Shiny black and found on the bark of apple trees on rough bark around buds. Adult Yellowish green with darker green longitudinal stripes down the body. Honey tubes short, pale green and flanged at the tip. Other pests with which the pest may be …
The severity of infestation of each apple orchard by apple grass aphid should be determined when the pre-blossom pest assessment is done at the green cluster to pink bud growth stage. Inspect at least two blossom trusses on each of at least 25 trees per …
There are few specific cultural controls for apple-grass aphid. Natural enemies should be encouraged by avoiding the use of broad-spectrum insecticides and by providing flowering plants in and around the orchard. Artificial refuges can be provided for …
Barbagallo, S., Cravedi, P, Passqualini, E, Patti, I, & Stroyan, H. L. G. 1997. Aphids on the principal fruit bearing crops. Bayer, Milan.123pp Minks, A. K. & Harrewijn, P. 1987. Aphids, their biology, natural enemies and control. World Crop Pests, …
An insecticide treatment for the aphid should be applied before blossom if the economic threshold of 50% of blossom trusses infested with 5 or more aphids is exceeded. Insecticide sprays should only be applied for this pest if strictly necessary as it …
Chemical control of apple grass aphid is usually not attempted in organic orchards because the pest only causes minor damage which is tolerated. Emphasis should be placed on cultural control measures such as the provision of artificial refuges for earwigs …
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