Remarkable, however biologically unknown sawfly Craesus latipes (Villaret) (Hymenoptera, Tenthredinidae)
2012
Urban, J., Mendelova Univ., Brno (Czech Republic). Ustav Ochrany Lesu a Myslivosti
In 2009 to 2011, a rather frequent occurrence of Craesus latipes was noted on Betula pendula in the Brno region, Czech Republic. One part of the sawfly population showed bivoltine and another part univoltine development. The bivoltine subpopulation was characterized as follows: imagoes occurred for the first time in the second half of May and at the beginning of June, for the second time in August. The univoltine subpopulation was characterized as follows: imagoes flew in the second half of June and in the first half of July. Females lay eggs into longitudinal slits in veins on the abaxial face of leaves. During several days (in the laboratory already during the first three days) they lay 91-133 eggs on 7-10 leaves. They die 1-3 days after oviposition. The embryonal development takes 6-7 (in the laboratory 4-5) days. Male larvae eat for two weeks (in the laboratory 12 days) and show 5 instars. Female larvae eat for three weeks (in the laboratory 16 days) and show 6 instars. Male larvae destroyed in captivity on average 19.8 square cm (female larvae 60.0 square cm) leaves of B. pendula. Larvae of the bivoltine subpopulation occurred on trees for the first time at the end of May and in June, for the second time in the second half of August and in the first half of September. Larvae of the univoltine subpopulation occurred from the second decade of June till the end of August, exceptionally even later. Eating larvae could be noted locally and in small numbers for nearly the whole growing season.
Afficher plus [+] Moins [-]Mots clés AGROVOC
Informations bibliographiques
Cette notice bibliographique a été fournie par Library of Antonin Svehla
Découvrez la collection de ce fournisseur de données dans AGRIS