The Effects of Relative Humidity at the Time of Flowering on Fruit Set in Bear Oak (Quercus Ilicifolia)

Fifty‐six randomly selected bear oak trees were moved into growth chambers to determine the influence of relative humidity at the time of flowering on fruit set. The effect of humidity greater than 61 % was to greatly reduce fruit set. Trees which were kept in a chamber where relative humidity was less than 50 % had significantly higher fruit set.