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  • Author or Editor: Yosef Burger x
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Two field experiments were conducted at Newe Ya'ar (northern Israel) to examine the effects of spacing and irrigation on the production of watermelons for seed consumption. Increasing population from 3000 to 12000 plants/ha significantly increased fruit number per unit area and only slightly decreased mean fruit weight. Increasing the water supply from dryland farming to weekly irrigation significantly increased mean fruit weight but had only a small effect on fruit number. Seed yield positively correlated with fruit number per unit area and to a lesser extent with fruit yield. In 1991, maximal seed yield (1.33 kg/10 m2) was obtained in the higher population density (10,000 plants/ha) supplied with one irrigation (800 m3 /ha) at fruit set. In 1992, maximal seed yield (1.24 kg/10 m2) was obtained in the highest population density (12,000 plants/ha) supplied with weekly irrigation. Mean seed weight was not affected significantly by spacing or irrigation regime, nor by fruit size or fruit number per unit area. Yellow Malali, derived by selection in a commercial field, had twice the seed yield as the commercial cultivar Malali.

Free access

The use of grafted vegetables as one of the alternatives to soil disinfestation with methyl bromide is increasing in Israel. Watermelon (Citrullus lanatus) and melon (Cucumis melo) plants are grafted mainly onto Cucurbita rootstocks for lessening losses due to soil-borne pathogens. The contribution of the rootstock to the grafted plant's resistance depends on the nature of the disease. In general, damage caused by non-specific root-rot pathogens such as Rhizoctonia solani, Macrophomina phaseolina, Monosporascus cannonballus, and Pythium spp. are effectively reduced by using Cucurbita rootstocks. However, these rootstocks provide only partial protection from vascular diseases such as fusarium wilt, in which case better protection can be achieved by grafting susceptible melons onto monogenic fusarium-resistant melon rootstocks. The performance of the grafted plants depends not only on the rootstock but also on the scion response to pathogens and on the effect of the environment on disease development. The response of grafted and non-grafted melons of different cultivars to sudden wilt disease caused by the fungus Monosporascus cannonballus was evaluated in field trials conducted in the fall and spring growing seasons. Significant differences in disease incidence were found among cultivars, between grafted and non-grafted plants, and between seasons. Grafting reduced plant mortality in the spring and fall experiments but prevention of yield losses was more effective in the spring. More emphasis should be given to finding suitable rootstocks and adjusting agrotechniques for successful commercial cultivation of grafted melons in the fall.

Free access

Abstract

Gene B of Cucurbita pepo L. conditions precocious yellow-fruit pigmentation and is incompletely dominant to its allele, B + (3). This gene is found in representatives of several C. pepo cultivar groups, including ornamental gourd, zucchini, straightneck, pumpkin, and acorn. In addition to its primary effect, gene B can have a number of secondary effects, such as yellow spotting of leaves, decreased fruit size, reduced yields, bright orange flesh color, increased carotene content of the flesh, and improved flavor. The extent to which a particular secondary effect is manifested is dependent upon the genetic background.

Open Access

Abstract

Precocious Caserta is a summer squash (Cucurbita pepo L.) of the vegetable marrow type. Unlike other vegetable marrows, its fruit are yellow with yellow broken stripes, and the flesh is bright golden yellow. Plant characteristics resemble those of ‘Caserta’, but leaves may exhibit much yellow spotting.

Open Access

Excess of boron and salinity in soil and irrigation water can limit the production of melons (Cucumis melo). A greenhouse study was conducted in order to compare the responses of grafted and non-grafted melon plants to combinations of high levels of boron and salinity. Boron levels were 0.25, 0.8, 2.5, 5.0, 10.0 mg·L-1 and salinity levels were 1.8 and 4.6 dS·m-1. Foliar injury caused by boron was more severe in the non-grafted than in the grafted plants. Likewise, boron accumulation in leaf tissue from non-grafted plants was higher than in grafted plants. High salinity led to decreased boron accumulation in the leaves. Fruit yield was decreased only at a boron concentration of 10 mg·L-1, and the decrease in grafted plants was smaller than that in non-grafted plants. A negative correlation was found between boron accumulation in leaves and fruit yield. The results showed that melon plants grafted on Cucurbita rootstock are more tolerant than non-grafted ones to high boron concentrations, and this can probably be explained by the decrease in boron accumulation caused by the rootstock.

Free access

Abstract

An Oriental pickling melon (Cucumis melo var. conomon) was crossed with a hermaphroditic melon, and the hermaphroditic form also was crossed with a birds-nest-type melon, with the goal of producing pickling melon breeding lines possessing a concentrated yield. Hermaphroditic and birdsnest breeding lines derived from these crosses produced markedly more fruits per plant and per unit area in a once-over harvest than did the pickling cucumber cultivars tested.

Open Access

Abstract

Two precocious yellow-fruited zucchinis (Cucurbita pepo L. cvs. Goldy and Gold Rush) and a green-fruited control, ‘Burpee Hybrid Zucchini9, were compared for yield and yield quality in a series of 6 trials conducted in Israel. Overall, ‘Goldy’ and ‘Burpee Hybrid Zucchini’ produced a similar number of fruits and yield of “Grade A’’ fruits, but ‘Gold Rush’ produced significantly less. Yield quality, expressed as the percentage of “Grade A” fruits, was higher in ‘Goldy’ and ‘Burpee Hybrid Zucchini’ than in ‘Gold Rush’. Off-color fruit production was the most important parameter which reduced yield quality in ‘Gold Rush’.

Open Access

Abstract

‘Benning’s Yellow Tint’ is a summer squash (Cucurbita pepo L.) of the scallop or patty-pan cultivar group that has uniformly light yellow exterior color and excellent quality.

Open Access