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  • Author or Editor: Aly M. Ibrahim x
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Squash is grown in the field and in tunnel type greenhouses in Saudi Arabia. To satisfy the demand for squash, additional production in controlled greenhouses would be desirable. The Jedida cultivar was treated with growth regulators. Seedlings were sprayed with Ethrel at 400 ppm. At flowering, six treatments were made: Agriton (60g/100L), sprayed at 10 day intervals; IAA (1%), IBA (1%), and Rootone, dusted on stigmas; hand pollination; and control. Fruits were harvested when they were 12 cm long. Ethrel increased the number of female flowers by 96% and changed the female: male ratio from 1:2 to 8:1. Highest marketable yield was obtained with the hand pollination, IBA, and IAA treatments. Yield in the Control treatment was low due to low insect activity. The results suggest that treatment with IAA or IBA will permit production of squash on a commercial scale in controlled greenhouses.

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Abstract

Plants of the ‘Crookneck 67-1-7’ rogue, derived from ‘Butternut’ squash, developed straight fruits when grown on a fence; those grown on the ground produced crookneck fruit. Length of neck and bulb circumference were greater in ground-grown crookneck fruit. The outer-curved part of crookneck fruit on the ground had the lowest width of hypodermal zone cells and this was due to an elongation of the cells in the direction of fruit length, while in fence-grown straight fruit, the cells were near-isodiametric. Cell number of the hypodermal zone was the same in all fruits. ‘Crookneck 67-1-7’ ground-grown fruit, oriented horizontally and level with the soil surface, and also vertically, blossom-end up or down, did not show any crooking. Crooking of fruit is due to the interaction of genotype and an impediment causing differential pressure on the cells on each side of the squash. Straightneck fruit, including ‘Butternut’ type, occurred in the F2 and BC generation of the cross of 2 crookneck types, ‘Crookneck 67-1-7’ × ‘Golden Cushaw’, indicating that different genes controlled the crookneck fruit trait in the parents.

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