Effectiveness of some insecticides in the control of Macrosteles laevis (Rib.) and protection of annual ornamental plants against aster yellows (AY) phytoplasma
2000
Soika, G. | Kaminska, M. (Research Institute of Pomology and Floriculture, Skierniewice, (Poland))
Observations carried out in 1998-99 on Callistephus chinensis, Tagetes erecta and T. patula L., revealed that Macrosteles laevis (Rib.) produced on these plants only a summer generation. First adults of this species appeared in mid June. They were most numerous in August and at the beginning of September. First larvae were recorded in the middle of July, reaching a peak at the end of the month. In the control of adult leafhoppers the best results were obtained with biphenthrin applied as 4 spray-treatments at two week intervals, starting at the beginning of the growing season. No relation was found between the density of M. laevis and numbers of Callistephus chinensis and Tagetes ssp. plants showing aster yellows (AY) phytoplasma symptoms
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