Population dynamics of <i>Chaetocnema tibialis</i> Illiger and <i>Phyllotreta vittula</i> (Redtenbacher) on the weed <i>Amaranthus retroflexus</i> L. and cultivated <i>Amaranthus caudatus</i> L
Cagáň, Ľ | Tóth, P. | Tóthová, M.
In 1995–1997, the population dynamics of the flea beetles <i>Chaetocnema tibialis and <i>Phyllotreta vittula</i>, associated with <i>Amaranthus retroflexus</i> (wild species) and <i>Amaranthus caudatus</i> (cultivated species), were studied at the locality Nitra-Malanta (48°19'N, 18°09'E) in south-western Slovakia. On both plant species, the number of <i>C. tibialis</i> adults was usually very low until the beginning of July. During July the number of <i>C. tibialis</i> increased, but sooner on cultivated amaranth. An increased number of <i>C. tibialis</i> adults was observed on both amaranth species until the middle of September. The results showed that amaranth plants are a very important reservoir of <i>C. tibialis</i> during summer. <i>P. vittula</i> was a common flea beetle on amaranth during the whole summer, but its numbers never exceeded more than 10 adults per 25 plants. Low temperatures in winter had a negative effect on populations of <i>C. tibialis</i> on both amaranth species and also on populations of <i>P. vittula</i> on <i>A. retroflexus</i>. The lower the precipitation was in July, the higher were the populations of <i>C. tibialis</i> on both amaranth species and the populations of <i>P. vittula</i> on <i>A. retroflexus</i>.
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