IMPORTANCE OF INSECT POLLINATORS FOR THE PRODUCTION IN THE CHESTNUT, CASTANEA SATIVA
The aim of this work is to quantify values of pollen carriers over the burr set and the production of chestnut, Castanea sativa Miller. Two types of flowers are produced by this species : first a great number the staminate catkins; secondly, bisexual catkins (androgynous) less abundant, found at the apical part of the annual branch. The abundant production of pollen characterises anemophilous plants. However, this species offers heavy and sticky pollen characteristic of entomophilous plants. In order to quantify the contributions of pollen carriers, 3 experimental groups where realised in East centre of Portugal, Sabugal : first, a control group constituted by a branch with the 2 types of flowers, free visited and exposed to wind and gravity; second, a group under a parallelipedic cage witch is covered with large meshes muslin. This method allows 80% of the wind to penetrate, but also protect the flowers to be visited by pollinators; the third group, under a cylindrical cage, covered with closed muslin in order to inhibit almost entirely the action of wind (only 20%) penetration), permitting gravity measurements. Some impacts on the burr set are related to the insect pollinators. However, the production of chestnut obtained depends directly on their action.
de Oliveira, D., Gomes, A., Ilharco, F.A., Manteigas, A.M., Pinto, J. and Ramalho, J. (2001). IMPORTANCE OF INSECT POLLINATORS FOR THE PRODUCTION IN THE CHESTNUT, CASTANEA SATIVA. Acta Hortic. 561, 269-273
Castanea sativa, pollinators, burr set, chestnut set