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  • Author or Editor: D. R. Paterson x
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Abstract

Disbudded ‘Brooks 56’ Rosa multiflora Thunb. plants were grown in 0.01 or 0.1 Steiner solutions and inoculated with indigenous vesicular-arbuscular mycorrhizal fungal (VAMF) species, Glomus fasciculatum (Thax. sensu Gerd.) Gerd. and Trappe. Inoculation resulted in a significant increase in both fresh and dry weight of the R. multiflora plants. Increasing the Steiner solution from 0.01 to 0.1 resulted not only in a significant decrease in the rate of VAMF infection, but also in a significant increase in the fresh and dry weight of the multiflora understock.

Open Access

Abstract

A high percentage of successful bud unions were obtained by bench chip budding selected Rosa hybrida L. budwood on dormant, unrooted Rosa multiflora Thunb. understock. Chip budding was successful using both hand technique and a Liliput grafting tool. Parafilm strips were the most effective graft wrapping material.

Open Access

Abstract

Out of 38 lines of sweet potato [Ipomoea batatas (L.) Lam.] which had demonstrated some resistance in laboratory tests to the sweetpotato weevil, Cylas formicarius elegantulus (Summers), 13 lines had significant levels of resistance, based on weevil free yield in artificially infested fields in Yoakum, Texas. Two lines, W 125 and W 119, previously released as having weevil resistance, maintained a high level of resistance.

Open Access

Research was conducted with sweet corn (Zea mays L.) to evaluate the presidedress soil NO3 test (PSNT) originally developed for use on field corn on a wide range of New Jersey soils. Soil NO3-N concentrations reflected differences in N availability due to manure or preplant N application. The relationship between soil NO3-N concentration and relative yield of marketable ears was examined using Cate–Nelson analysis to define the PSNT critical level. Soil NO3-N concentrations >25 mg·kg–1 were associated with relative yields at ≥92%. The success rate for the PSNT critical level was 85% for predicting whether sidedress N was needed. Including NH4-N in the soil analysis did not improve the accuracy of the soil test for predicting whether sidedress N was needed. Although the PSNT is quite accurate in identifying N-sufficient sites, it appears to offer only limited guidance in making N-fertilizer rate predictions. The PSNT is most useful on manured soils, which frequently have sufficient N. The test likely will help decrease the practice of applying “insurance” fertilizer N and the ensuing potential for NO3 pollution of the environment.

Free access

Abstract

Six sweet potato (Ipomoea batatas (L.) Lam.) breeding lines, W-71, W-115, W-119, W-125, W-149 and W-154, possessing moderate levels of resistance to the sweet potato weevil, Cylas formicarius elegantulus (Summers), in combination with resistances to other released. They have dark orange flesh, relatively high yields and generally acceptable canning and baking qualities.

Open Access

Abstract

Forty-five lines of sweet potato (Ipomoea batatas (L.) Lam) were rated for resistance to the sweet potato weevil in artificially infested fields at Savannah, Georgia and at Yoakum, Texas. Ten lines were resistant in Savannah, 16 lines in Yoakum, and 3 lines were resistant in both locations.

Open Access

Abstract

The ‘Resisto’ sweet potato [Ipomoea batatas (L.)Lam.] developed jointly by the U.S. Department of Agriculture, the South Carolina Agricultural Experiment Station, and the Texas Agricultural Experiment Station, combines high yield and excellent baking and canning quality with resistances to disease and insect pests not available in present cultivars.

Open Access

Abstract

‘Regal’ sweet potato [Ipomoea batatas (L.) Lam.] was developed jointly by the USDA, the South Carolina Agricultural Experiment Station, and the Texas Agricultural Experiment Station. This cultivar has high yield and excellent baking flavor in combination with high levels of resistance to a wide array of diseases and insects.

Open Access