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Unaspis citri (citrus snow scale) U. citri is one of the principal pests of Citrus spp. in many of the citrus-growing regions of the world. It infests the trunk, branches and small...
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Unaspis yanonensis (arrowhead scale) Fruits, leaves and small branches are attacked, but not large branches or trunks. Only the second and third generations are found on fruits...
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Urentius hystricellus (eggplant lace bug) Mild to moderate infestations of U. hystricellus have been reported on aubergines in India, Ghana, Saudi Arabia, and Thailand (see Control). No...
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Vespula germanica (German wasp) Introduction and establishment of V. germanica has been recorded in New Zealand (1944), Australia (1959), South Africa (1972), United...
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Viteus vitifoliae (grapevine phylloxera) Although the implacable spread of V. vitifoliae through European vineyards could in everyday language be regarded as 'invasive', it was actually...
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Xestia c-nigrum (spotted cutworm) X. c-nigrum is considered to be a minor agricultural pest in most of its range, but can develop into a major local infestation on a wide variety of...
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Xiphinema (dagger nematode) The virus-transmitting species of Xiphinema are of great importance to the orchard and soft fruit industry in the USA and to vineyards worldwide....
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Xiphinema americanum (dagger nematode) Direct damage to strawberries, fruit trees, forage legumes and forest trees has occurred in the USA. X. americanum is thought to be a major...
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Xiphinema diversicaudatum (dagger nematode) X. diversicaudatum, frequently in association with arabis mosaic (ArMV) and strawberry latent ringspot (SLRSV) nepoviruses, is widespread...
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Xiphinema ifacolum (dagger nematode) Several reports suggest that X. ifacolum is capable of causing damage to rice in Liberia (Lamberti et al., 1987, 1991) and to black pepper in Sri...
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