. Cooperative economic insect report. Beneficial insects; Insect pests. - 209 - INSECTS NOT KNOWN TO OCCUR IN THE UNITED STATES A BRAMBLEBERRY LEAFHOPPER (Macropsis fuscula (Zetterstedt)) Economic Importance: An outbreak of this leafhopper was discovered on logan- berry on Lulu Island, British Columbia, in 1952. It had not been reported previously from North America. Heavy infestations have occurred yearly since 1952 in the Lulu Island area causing considerable damage to various bramble- berries through feeding on flowers and fruit and through heavy deposits of honeydew. The infestations have
. Cooperative economic insect report. Beneficial insects; Insect pests. - 209 - INSECTS NOT KNOWN TO OCCUR IN THE UNITED STATES A BRAMBLEBERRY LEAFHOPPER (Macropsis fuscula (Zetterstedt)) Economic Importance: An outbreak of this leafhopper was discovered on logan- berry on Lulu Island, British Columbia, in 1952. It had not been reported previously from North America. Heavy infestations have occurred yearly since 1952 in the Lulu Island area causing considerable damage to various bramble- berries through feeding on flowers and fruit and through heavy deposits of honeydew. The infestations have been difficult to control. Although the insect has been known to cause direct plant damage for some time, it assumed a more important economic status when it was shown to be the vector of the destructive Rubus stunt virus of Europe in 1953. This virus is not known to occur in North America. Symptoms of Rubus virus on loganberry are as follows: New canes weak, short, thin, much more numerous than usual, giving bushy appearance. The following season weak canes generally fail to flower. Flowers on infected canes less numerous than normal and may be malformed, floral parts becoming foliar. Disease is progressive, plant becoming more stunted and bushy in successive years. On raspberry, best diagnostic characters are late development and shortness of laterals early in General Distribution of Macropsis fuscula Distribution: Europe (Italy, France, Belgium, Netherlands, Germany, England, Denmark, Norway, Sweden, Finland, northern USSR) and British Columbia, Canada. Hosts: Rubus spp. (loganberry, raspberry, thimbleberry, blackberry, et al.). Life History and Habits: The insect overwinters in the egg stage in canes of wild and cultivated Rubus spp. In British Columbia, the eggs hatch in late May, about the time loganberries begin to blossom. Nymphs are numerous by mid-June, with as many as 7 per cluster of fruit buds in some plantings. There are 5 instars, each stage requiring ab
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Keywords: ., bookcentury1900, booksubjectbeneficialinsects, booksubjectinsect
