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  • Author or Editor: A. M. Lasheen x
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Abstract

Naphthaleneacetic acid (NAA) applied as a spray to apple trees on May 7 reduced fruit set, number of seed per fruit, percent and amount of reducing sugar in flesh of young fruits but did not affect protein level or fruit size. Fruit from trees sprayed with NAA on May 18 had more seed and less reducing sugar than the checks. The late NAA spray also reduced fruit size and set but did not affect the protein level of flesh or seed. Sprays of 1-naphthyl methylcarbamate (Sevin) applied on the same dates reduced fruit set but did not affect other factors measured. We propose that the reduced metabolite supply (reducing sugar) in the young fruit is the primary reason for reduced fruit set on trees sprayed with NAA and that effect on seed number is not related to this change in composition.

Open Access

Abstract

Thompson Seedless’ and ‘Ruby Seedless’ vines were girdled and/or treated at bloom with GA3 (‘Thompson Seedless’ at 5 ppm and ‘Ruby Seedless’ at 1, 5, and 20 ppm), and/or at fruit set (just after berry shatter) at 20 and 40 ppm. Results for ‘Thompson Seedless’ grapes (Vitis vinifera L.) indicate a significant increase in berry weight resulting from GA3 spray or girdling at fruit set. The greatest increase was obtained from a combination of girdling and GA3 spray. Soluble solids and titratable acidity were not significantly affected. Results for ‘Ruby Seedless’ grapes indicate significant fruit thinning at 5 and 20 ppm but not at 1 ppm. No increase in berry size was recorded, but a significant increase in soluble solids and a decrease in acidity were obtained with bloom-sprayed vines at 5 and 20 ppm.

Open Access

Abstract

Five clones of strawberries varying in degree of resistance to the two-spotted spider mite, Tetranychus urticae Koch, were grown at four nutrient levels. Foliage samples were analyzed for minerals, amino acids, total sugar and total starch. The plants were infested with this mite and were rated for injury. Nitrogen of clones and treatments showed significant correlation with mite injury at the 0.05 and 0.01 levels respectively. Phosphorus of clones was significantly correlated with mite injury. Mite injury and treatments, but not clones, were significantly correlated when the amino acids classified as non-essential to Tetranychus urticae were considered. Total starch and total sugar of treatments had significant negative correlations with mite damage.

Open Access