2019,    N 1 (35)    

GENERAL AGRICULTURE, PLANT GROWING

Borodiy S., Borodiy P.

Bionomic features of Ozirhincus tanaceti (Cecidomyiidae, Diptera) in the tansy station (Tanacetum vulgare L.)

The subject of the study is Ozirhincus tanaceti (Cecidomyiidae, Diptera) in tansy stations. The purpose of the research is to substantiate the feasibility of protecting cultural tansy plantations from gall midges Ozirhincus tanaceti in the conditions of the Kostroma region. Studies were carried out in 2012 ... 2016 in the Kostroma, Kirov regions, Perm region, the Republic of Udmurtia. It was established that the gall midge of Ozirhincus tanaceti inhabits the entire surveyed territory. The colonization of tansy flowers by the larvae and the formation of galls began in the third decade of July, lasted until September, and depended on the duration of flowering of the tansy. The maximum number of galls was observed at the beginning of the second decade of August. The larvae, hatching at the end of the growing season, wintered in a state of diapause until the third decade of April of the following year in galls directly in inflorescences or on the soil surface under snow. The population of inflorescences depended on the age of the biotope, the abundance of the trophic resource, and the spatial isolation of the plantation from the old-age coenopopulations of tansy. In the anthropogenically disturbed area with single plants, the population was lower compared to the side of the road and the anthropogenically transformed meadow by 9.20 and 10.53%, respectively. In the first two years after the establishment of a cultural plantation, the occupancy was lower on average by 14.54% compared with the wild-growing coenopopulation removed by 3 km. The correlation between population and population density of inflorescences was at the level of 81.2% in the wild-growing coenopopulations and 78.12% in the cultural plantation. The average damage to fruits in the inflorescence was 5.9%, which indicates the inappropriateness of special protective measures to reduce the harmfulness of gall midges in cultivated plantations.

Keywords: OZIRHINCUS TANACETI, COMMON TANSY, TANACETUM VULGARE L., HARMFULNESS OF GALL MIDGES