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Classification and host plants
Species: P. reaumuri Kaltenbach
“Phytopathology, agricultural entomology and applied biology” – M.Ferrari, E.Marcon, A.Menta; School edagricole - RCS Libri spa
Host plants: Linden.
Identification and damage
Patchiella reaumuri is a fairly dangerous aphid as it determines a marked curling and rolling of the young apical shoots and leaves; the apical buds necrotize, block in the development, with consequent loss of the cimal. These aphids live in colonies whose individuals are very clear in the early stages; adults, on the other hand, take on dark purple hues.
Patchiella reaumuri is a dioecious aphid; winters on the Linden, primary host, at the egg stage. In spring, in April, the first founders appear, originating some spring parthenogenetic generations, on the Tiglio; these generations are responsible for the damage described. At the beginning of the summer the winged forms (migrants) appear that are brought to the secondary hosts (marsh reeds or other spontaneous Graminaceous plants); subsequently, at the end of summer-autumn, they return to the lime tree to lay the egg that will have to overwinter.
Wild lime tree Tilia cordata L.
The direct chemical fight against Patchiella reaumuri and the type of product to be used are based on: the severity of the infestation and its progress (very curled leaves); the type of environment in which the guest is located (avenues, parks or gardens, urban greenery, production nursery, etc.); the technical possibility of carrying out the intervention; large specimens and places of residence are limiting the technical / economic possibility of carrying out the intervention.
In any case, under the conditions in which it is possible to carry out the treatments, systemic aficide products must be used in order to reach the aphid, protected inside the curled leaves. As for the advisability of carrying out the intervention, please refer to what is indicated for Eucallipterus tiliae.