ISHS Acta Horticulturae 367: VI International Symposium on Pear Growing
RESISTANCE SOURCES TO PSYLLA SP. |
| Authors: | N. Braniste, V. Amzar, M. Radulescu |
| Abstract:
The systematic study of Psylla sp. and the screening for genetic resistance to be used in the breeding program for getting new varieties with a fruit quality similar to that of susceptible cultivars, has been initiated at the Research Institute for Pomology, Pitesti-Maracineni since 1980. There have been under study 450 genotypes of Pyrus genus belonging to National Collection in Pitesti - Maracineni. The damage on buds, shoots, flowers and fruit caused by this insect was recorded. Also, the number of generations per year correlated with eggs amount and high temperatures was established. Biochemical investigations on some interspecific cultivars and hybrids (. communis x P. serotina) compared to susceptible ones have emphasized the presence of some specific compounds. Under favourable conditions for Psylla development (3–5 generations per year) 7 species not damaged by this insect were identified. Among 20 foreign varieties, 11 belonging to P. serotina sp. and 9 to P. communis sp., none of them have shown any trace of damage caused by Psylla. Among the autochtonous cultivars, we have found 7 ones resistant to Psylla. Interspecific hybrids of P. serotina x P. communis were obtained to be used in the breeding program started in 1980. | |
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