PFA in walnut at the Central Valley of Chile
Female flower abortion caused by lack and excess of pollen was studied during 3 seasons (2014 to 2016), at San Bernardo, and at Paine orchards, close to Santiago, Chile. Cultivars studied were Serr, Chandler, Howard, and Franquette. The first season Serr showed 37.2% abortion, where 27.8% was due to excess of pollen. Serr was the most affected cultivar for this cause, compared with the other cultivars under evaluation. In the season 2015-16 Serr presented 56.3% abortion and excess of pollen was 36.7%. In the 2016-17 season, Serr showed 38.3% abortion. Excess of pollen induced 32% of that abortion, compared with Franquette, which had only 5% abortion; 4% caused by excess of pollen. The differences between cultivars are probably genetic. However, differences between seasons are due to chilling accumulation each winter time.
González R., C., Lemus S., G., Jelves A., V., Puelles A., N., Guerra A., H., Cuevas I., B., Romero P., I., Guerrero, G., Henríquez M., M. and Corrales E., R. (2021). PFA in walnut at the Central Valley of Chile. Acta Hortic. 1318, 87-90
pollination, abscission, cultivars