Akademik Veri Yönetim Sistemi
International Conference on Food, Agriculture and Animal Sciences 13-17 October 2021, Erzurum, TURKEY, Erzurum, Türkiye, 13 - 17 Ekim 2021, ss.55
Determination of the biology and damage of Nematus (=Croesus) septentrionalis (L., 1758)
on Betula pendula Roth tree. The material of the study consists of larvae and adults of Nematus (=Croesus)
(L.,1758) septentrionalis from the family Tenthredinidae (Hymenoptera, Symphyta) collected from birch
(Betula pendula Roth) trees in Erzurum City Center, Campus of Atatürk University, Tekederesi and
Aziziye Campus, and pupa samples taken from the root regions. The samples were collected in 2019 and
2020, between 20 June - 20 September. A preliminary study was conducted in 2018 to determine the pest's
biology. The adults sample were collected from B. pendula in sunny weather and daytime by sweep net.
Larvae were collected by cutting leaves of the branch on which they were fed with the help of pruning
shears. Pupa stage was obtained by digging four fingers deep (10-15 cm) with the help of anchor in the root
and crown projection area of the Betula pendula tree. The adults collected were placed in a jar and killed
with the aid of ethyl acetate. The killed samples were transferred to small cardboard boxes, which has label
the location, height and date of collection were written, and they were brought to the laboratory and pinned.
The larvae were taken into a desiccator with soil at the bottom, along with the leaves they were fed on,
cotton moistened with water was placed to provide moisture, and fresh leaves were brought every other day
to ensure that the larvae are fed, matured and become pupae. As a result of the study, the egg laying times,
hatching time, larvae time and number of generations of Nematus (=Croesus) septentrionalis were
determined in field conditions. In addition, damaged trees were counted to determine the contamination
rate, then the number of damaged leaves on a branch randomly selected from the trees was determined, and
the number of eggs and larvae in the leaf was also determined. With this study, the biology of Nematus
(=Croesus) septentrionalis and its damage on Betula pendula has been detected. Information that will be
useful for researchers who will conduct study on this subject in the following years has been presented. It
was determined that the pests gave one generation in a year under Erzurum conditions.