Zur Kenntnis der Blattminen-MotteCameraria ohridella Desch. & Dim. (Lep., Lithocolletidae) anAesculus hippocastanum L. in der Tschenchischen Republik |
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Authors: | V Skuhravy |
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Institution: | (1) Present address: Entomologisches Institut der Akademie der Wissenschaften, Braniŝovská 31, 370 05 Ĉeské Budêjovice, Tschechische Republik |
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Abstract: | Cameraria ohridella was recorded first in 1985 in Macedonia. It gradually expanded to north and west and at present it is a serious pest of Horse
ChestnutAesculus hippocastanum in the Czech Republic, having been established at about 80 localities. There are 4–5 overlapping generations with sizes of
the larvae of 0.4–4.0 mm. The larva develops inside the leaf tissue in the upper parenchym layer of the leaflet and causes
a mine, the size of which is broadened with growing larva. First adults start to fly at the end of April. After mating the
females lay single eggs on the leaves. Larval development lasts 25–30 days followed by the prepupa I and II. The latter spins
a cocoon in which the pupa of the last generation hibernates. The development from L4 to the prepupa lasts for 3–6 days at
22°C. During the summer it is possible to find all larval and prepupal stages in attacked leaves. FourAesculus species:A. parviflora Walk,A. carnea Haey.,A. glabra Walk andA. indica J. Hobb. were found to be resistent toC. obridella. A. lutea H. J. was liftle andA. pavia L. was heavily attacked. The parasitization ofC. o. larvae was very low. Only 2 parasites were found in 1500 mines in the first and second generation ofC. o., and 40 parasites in 1000 mines of the fourth and fifth generation. The highest mortality takes place in moths, eggs and
young larvae. It was found in all 4 generation that there were i. m. 50 eggs/leaflet from which i. m. 3 hibernating pupae
resulted. Supposing 2 moths (1♀, 1♂)/leaflet emerged in spring which produced 50 eggs (75 eggs/♀—33% moth mortality), the
density of eggs in the first generation after hibernating being the same as in the last (fourth) generation before hibernating.
As to the whole populations density in this case we can calculate as following: 3 pupae/leaflet on the tree=3000 pupae/leaflets
pro m2 on the soil=2000 emerging moths pro m2=50,000 moths (25,000 ♀♀) pro tree (namely 25 m2 projecting area of the tree crown×2000 moths).
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