02596nas a2200229   4500008004100000245012300041210006900164260001200233300001200245490000700257520144800264653006901712653005001781653007901831653006701910653007001977653008902047653006802136100001902204700001902223856012402242       1975                        eng d00aBiology and host specificity of the Chondrilla root moth Bradyrrhoa gilveolella (Treitschke) (Lepidoptera, Phycitidae)0 aBiology and host specificity of the Chondrilla root moth Bradyrr  c06/1975  a171-1850 v653 a<p>The biology and ecology of Bradyrrhoa gilveolella (Treitschke), recently introduced into Australia as a possible biological control agent for the composite Chondrilla juncea, is described for Greece and compared with its known biology in southern Russia. The moth occurs from eastern Europe to southern Russia. In Greece it has two full and possibly a partial third generation each year. Its larvae live in cases below the soil surface and feed on the rootstocks of Chondrilla spp., destroying the thinnest plants. Heavy larval infestations on Chondrilla occur erratically in eastern Greece, being dependent on sites on sandy or very friable soils that are only occasionally disturbed; populations in hotter southern Greece appear to be less stable than those in the cooler northern regions. The larvae are heavily attacked by the fungus Beauveria bassiana as well as by Bracon sp., Copidosoma sp. and Syzeuctus sp. (Hymenoptera) and by the Tachinid Germaria graeca (Br. &amp; Berg.); these cause a total larval and pupal mortality of up to 80%. Host specificity studies, during which the roots of various wild and cultivated composites and 62 cultivated plants were exposed to the moth larvae, showed that only Chondrilla and the closely related genus Taraxacum were attacked. A field survey showed that Taraxacum was not a host under natural conditions. All forms of C. juncea were equally readily attacked by B. gilveolella larvae.</p>
10aCombined effect of parasites on Bradyrrhoa gilveolella in Greece10aMaximum and minimum temperatures and rainfall10aof areas where Bradyrrhoa gilveolella occurs in southern Russia and Greece10aPlant species tested for specificity of Bradyrrhoa gilveolella10aSurvey of Bradyrrhoa gilveolella in northern Greece during winter10aWinter decline of larval populations of Bradyrrhoa gilveolella and climate in Greece10aWinter disappearance of Bradyrrhoa gilveolella larvae in Greece1 aCaresche, L.A.1 aWapshere, A.J.  uhttps://icgf.myspecies.info/content/biology-and-host-specificity-chondrilla-root-moth-bradyrrhoa-gilveolella-treitschke