Summer squash cultivars ( Cucurbita pepo L.) of the Zucchini type were classified on a scale of 1 (open) to 5 (dense growth habit). A trial with 5 cultivars indicated that yield is not dependent on heavy foliage, and that picking time required per unit of crop is much less with open growth habit. An inheritance study was inconclusive because of problems in progeny plant classification. It appears that growth habit is a complex of several characteristics, and as such, is inherited in a multigenic manner.
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J. R. Baggett (1972) studied this question.