Visual inspection Orchards should be inspected regularly, preferably fortnightly, from the green cluster growth stage (April) through to mid-summer (end of June) for signs of infestation and or damage. Critical growth stages are late green cluster (so …
Work in Switzerland showed that winter eggs of rosy apple aphid hatch between 100 and 180 degree days, 50% emergence being reached at 130 degree-days above a thermal threshold of 4.5 °C. Temperature sums are started from 1 January. Rosy apple aphid eggs …
Spring sprays Rosy apple aphid populations should be carefully monitored in spring at the green cluster to pink-bud growth stage and again during and after blossom. The rosy apple aphid is easier to control shortly after eggs have hatched and before …
Physical methods Organic growers are sometimes forced to physically destroy colonies to prevent them spreading. This is sometimes done when hand-thinning fruitlets. This is very labour intensive and small colonies are often missed which flare up …
A wide range of predators and parasites are natural enemies of rosy apple aphid. However, when weather and tree growth conditions are favourable in spring, population increase by the aphid is too rapid for natural enemies to prevent population increase …
Effective biological control approaches for this pest have not been developed. Artificial introduction of predatory insects is uneconomic. Biopesticides based on the use of entomopathogens need to be …
Barbagallo, S., Cravedi, P, Passqualini, E, Patti, I, & Stroyan, H. L. G. 1997. Aphids on the principal fruit bearing crops. Bayer, Milan.123pp Blommers, L. H. M. 1999. Probing the natural control of rosy apple aphid Dysaphis plantaginea (Pass.) …
Life cycle Pest status Other hosts Varietal susceptibility Distribution Damage Recognition Monitoring Forecasting Chemical control Cultural control Natural enemies Biological control Further …
Rosy apple aphid, also known as ‘blue bug’, is one of the most important and damaging pests of apple. A similar species, the pear bedstraw aphid, attacks pear. The life cycle involves migration between the two hosts apple and plantain. All …
When to assess Key times for pest assessments Sample size Where to sample How to sample Home made beating tray Organising the assessments Thresholds …
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