Abstract
1. A study has been made of the influence of day and night temperatures, photoperiod, and light intensity upon the effectiveness of 2-naphthoxyacetic acid (2NA) for the setting of parthenocarpic fruit in the tomato, Lycopersicon esculentum, variety Essex Wonder. Results include a quantitative comparison of percentage set, yield, and average weight and size, for fruits from normally fertilized plants and from those sprayed with the growth substance. 2. In general, the conditions under which 2NA was most effective paralleled those under which the highest yields of normally fertilized fruits were obtained. 3. At very high day or night temperatures, especially when light intensity was low, 2NA was either poorly effective or failed completely to induce ovary development, even though small sets of fruits arose by natural fertilization. Under lower temperatures percentage setting was generally somewhat higher in 2NA-treated blossoms, while at very low temperatures there was an indication that 2NA may induce a hi...
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