Abstract:
The pests of Robinia pseudoacacia and their importance in forest economy of the Republic of Moldova weren’t studded enough and unpublished. In the last 10 years on the black locust were observed three phytophagous invasive leaf miners species which also are the most important insect pests: are Black locust leaf Miner – Macrosaccus robiniella (Clemens, 1859) and Locust Digitate Leafminer – Parectopa robiniella Clemens, 1863 (Lepidoptera: Gracillariidae). But, in 2010 the things changed, through of a new invasive pest: Obolodiplosis robinia (Haldeman 1847) (Diptera: Cecidomyiidae). In the conditions of the republic of Moldova O. robinia has 3 and if weather conditions are favourable then was remarked and the fourth generation (in 2013), but population are in numerical diminutions. Duty our investigation during of 2013-2014 we observe that the first and the second generation have increase population what we can not say about the last two generation. The diminution of the last generation is duty of parasite P. robiniae. The development of parasitoid stages especially pupal and adult in individual cocoons formed by the larvae can be seen through translucent larval integuments of the o. robiniae carcass. The number of cocoons per host larva varied from 5 to 25. As a rule, adult parasitoids soon emerged from the cocoons. However, was observed that beginning with last decades of July, several adult parasitoids remained inside the o. robiniae larval integument and fall in hibernation.
Description:
Affiliation: N. Stahi, Forest Research and Management Institute (ICAS), Chisinau; A. Timuș, Institute of Zoology of Academy of Sciences of Moldova
