ISHS Acta Horticulturae 652: I International Symposium on Grapevine Growing, Commerce and Research
SUSCEPTIBILITY OF SOME GRAPEVINE CULTIVARS IN AREA OF VINEYARDS OF PODGORICA ON THE ATTACK OF EUROPEAN GRAPE BERRY MOTH - LOBESIA BOTRANA DEN & SCHIFF, LEPIDOPTERA, TROTRICIDAE |
| Author: | H. Snjezana |
| Keywords: | sensitive, compactness, infestation, cluster, flower |
| Abstract:
Economically the most important pest of grapevine in area of vineyards of Podgorica is Lobesia botrana Den. et Schiff. (Lepidoptera, Tortricide). Larvae feeding in flower buds, flowers, green and mature grape berries cause damage. Larvae might finish their development even on young leaves. Not all the cultivars have the same susceptibility to the moth attack. This depends on the bunch compactness, as well as on the composition and thickness of berry epidermis and sugar content in grapes. Investigations were conducted during 1998 and 2000 on three grapevine cultivars: Vranac, Rkaciteli and Cardinal on second generation of moth. On 25 randomly chosen grapevine plants, 4 bunches of grapes were examined in detail to check moth presence and calculate the number of cocoons on 100 bunches of grapes. For the first moth generation in the period of full bloom, all bunches of grapes from 25 grapevine plants of nine cultivars (Vranac, Kratosija, Krstac, Cardinal, Ribier, Pleven, Early Afus Ali, Clotild Prosperi and Caus × Bulgar), were examined during the period of investigation. Average number of cocoons on 100 bunches of grapes was calculated. The most important attack of the grape berry moth was in Krstac cultivar, which is one of the most represented autochthonous cultivar with white epidermis, followed by Vranac and Kratosija. According to the observations, those three cultivars had the most compact clusters. The highest percentage of infested bunch of grapes in the second generation was in Vranac cultivar that also had the most compact bunch of grapes. Considering that the most susceptible cultivars to the moth attack were those with compact clusters and bunches of grapes, and also that females lay eggs on the bunches protected from the direct sun, the training system that allows the better plant aeration possible, should be chosen, during the grapevine growth. | |
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