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, …
Life history Pest status Other hosts Varietal susceptibility Distribution Damage Monitoring Forecasting Chemical control Natural enemies, cultural and biological control Further …
Woolly aphid is a sporadic pest of apple, which is sometimes present at low levels in orchards but only increases to cause problems in some years. Damage is expected to occur in years after warm winters when aphid colonies increase in early summer and …
Overwintered eggs are laid under loose bark or in deep crevices in the bark of the main trunk and branches of the tree. The eggs hatch in spring at early green cluster and colonies develop on the undersides of the rosette leaves. Later, infestations …
Some apple varieties are resistant to rosy leaf curling aphid, notably Cox. Others, such as Bramley, are susceptible and some, notably Golden Delicious and Worcester Pearmain are highly susceptible. The single gene responsible for resistance has been …
Widely distributed but local, often occurring on the same few trees in an orchard in successive years. …
Egg Shiny black and found on the bark of apple trees. Adult Grey to dark bluish grey, dusted with a white waxy powder and with short, black, tapering honey tubes which are flanged at the tip. Other pests with which rosy leaf curling aphid may be confused …
The severity of infestation by rosy leaf curling aphid should be determined in each orchard when pest assessments are done before blossom at the green cluster to pink bud growth stage. Attention should be focussed on highly susceptible varieties (e.g. …
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