D. P. Weingartner's research while affiliated with University of Florida and other places

Publications (23)

Article
Tobacco rattle virus (TRV) was detected in potato tubers by reverse transcription of RNA followed by amplification of the cDNA by polymerase chain reaction (PCR). Primer A complementary to residues 6555 to 6575 and primer B identical to residues 6113 to 6132 of TRV-SYM RNA-1 were used. After amplification, the 463-bp fragment was cloned, sequenced,...
Article
Belonolamius longicaudatus is a highly virulent nematode pathogen of many important crops in the southeastern United States, yet there have been few comparative studies among different populations. The objective of this study was to determine the population behavior and developmental biology among several isolates obtained from varying geographical...
Article
Belonolaimus longicaudatus has been reported as a complex species because of its variations in morphology and pathogenicity among different isolates. However there is no information about genetic characteristics of B. longicaudatus among different populations coupled with detailed morphological characteristics. Our objectives were to determine the...
Article
The multiple evaluation of potato cultivais and breeding selections (clones) for disease during the season can be costly and may not be necessary for accurate assessments of disease resistance or susceptiblity. For diseases whose progression can be described by sigmoid curves, an estimate of the area under the disease progress curve from two data p...
Article
A computer program was developed to simulate the random collection of tuber samples from potato fields with corky ringspot (CRS). Tubers were harvested from 16 plots in the 1993-94 and 1994-95 seasons, and the incidence and severity of CRS symptoms were assessed. Inputs for the program were number of healthy and CRS-affected tubers and severity tub...
Article
Full-text available
Changes in the oomycetePhytophthora infestans in the United States and other parts of the world pose a significant threat to potato production. A continual evaluation of potato clones for resistance to late blight is necessary to identify clones with resistance and to monitor the stability of resistance in light of the emergence of new and more agg...
Article
In a 3-year field study, population densities of Belonolaimus longicaudatus and other plant-parasitic nematodes and crop yields were compared between potato (Solanum tuberosum) cropping systems where either sorghum-sudangrass (Sorghum bicolor x S. arundinaceum) or velvetbean (Mucuna pruriens) was grown as a summer cover crop. Population densities o...
Chapter
Only general aspects on the biology of soil-borne vectors and their viruses relative to seed potato production will be addressed in this chapter. More detailed information on this topic can be found in several excellent review articles and texts published in recent years (Harrison, 1977; Trudgill et al. 1983; de Bokx and van der Want, 1987; Jones,...
Article
An experiment was conducted to determine population changes and niche variation in the soil at two depths (0 to 20 cm and 20 to 40 cm) of Paratrichodorus minor and Belonolaimus longicaudatus populations following fumigation. Eight plots each of potato (Solanum tuberosum) and cabbage (Brassica oleracea var. capitata), fumigated with 1, 3-dichloropro...
Article
Belonolaimus longicaudatus has long been recognized as a pathogen of potato (Solanum tuberosum). However, a damage function relating expected yield of potato to population densities of B. longicaudatus at planting has not been derived, and the economic threshold for nematicide application is unknown. The objectives of this study were to derive the...
Article
Belonolaimus longicaudatus has been reported as damaging both potato (Solanum tuberosum) and cotton (Gossypium hirsutum). These crops are not normally grown in cropping systems together in areas where the soil is infested with B. longicaudatus. During the 1990s cotton was grown in a potato production region that was a suitable habitat for B. longic...
Article
Belonolaimus longicaudatus is a recognized pathogen of cotton (Gossypium hirsutum), but insufficient information is available on the population dynamics and economic thresholds of B. longicaudatus in cotton production. In this study, data collected from a field in Florida were used to develop models predicting population increases of B. longicaudat...
Article
Full-text available
Sting nematode (Belonolaimus longicaudatus) is recognized as a pathogen of cotton (Gossypium hirsutum), but the expected damage from a given population density of this nematode has not been determined. The objective of this study was to quantify the effects of increasing initial population densities (Pi) of B. longicaudatus on cotton yield and root...
Article
For three crop seasons, potatoes (Solanum tuberosum L.) were grown in the field to evaluate the use of an automatically controlled subsurface drip (SDI) irrigation system with conventional semi-closed seepage irrigation (subirrigation). Both the SDI irrigation system and the automated irrigation control system performed well, and crop yields produc...
Article
Full-text available
Changes in the fungal pathogenPhytophthora infestans in the United States pose a significant threat to potato production. Sources of resistance to these new genotypes of P.infestans need to be identified for potato breeders to have parental materials for crossing, and the phenotypic stability of late blight resistance in these potato clones needs t...
Article
Full-text available
Pasteuria penetrans is a promising biological control agent of plant-parasitic nematodes. This study was conducted to determine effects of temperature on the bacterium's development in Meloidogyne arenaria. Developmental stages of P. penetrans were viewed with a compound microscope and verified with scanning electron microscopy within each nematode...
Article
Nematode extraction using centrifugal flotation depends on adequate suspension of the soil subsample in water. The purpose of this study was to compare two techniques for suspending the soil subsample in water (by stirring the soil in water by hand or using the force from a high-pressure water nozzle) when using the centrifugal sugar flotation tech...
Article
Environmental conditions of selected Mediterranean and Chilean sites, where potato cyst nematodes (Globodera rostochiensis and G. pallido) are established as damaging pests of short-cycle potato crops, were compared with those of potato-growing areas in Florida. Potato cyst nematode biological data from these locations were used as parameters to pr...
Article
In studies on a sandy soil in Florida over a 3-yr period (1984-86), applications of Ca (CaSO4) inconsistently affected the bacterial soft rot potential of potato tubers (Solanum tuberosum). The potential was estimated from the severity of the disease (percent surface area decayed) in tubers that had been immersed in an aqueous cell suspension of Er...
Article
Potatoes (Solanum tuberosum L.) were grown during 3 seasons on an Ellzey fine sandy soil to evaluate the effects of Ca and K rate, Ca placement, and cultivar on tuber yield and Ca and K concentration. Mehlich I soil extractable Ca concentration ranged from 436 to 860 mg·kgt-1. Application of Ca at 0, 450 and 900 kg·hat-1 from gypsum increased soil...

Citations

... such as A. brassicicola, with disease most severe in the spring season (17 to 32°C, average daily mean) as compared with the winter season (7 to 23°C, average daily mean) of three cultivars of cabbage (viz.,Abbott & Cobb No. 5,Gourmet,and Market Prize) in the field (Fontem et al. 1991). For A. japonica, Alternaria leaf spot disease development at the particularly favored temperature of 23°C was correlated with disease development, while 13 to 31°C was correlated with spore germination and secondary conidial production for A. japonica (Rimmer et al. 2007). ...
... Cover cropping with sorghum in southeastern Florida aggravates problems with wireworms (Coleoptera: Elateridae), which may be problematic in potato production. Early harvest of sorghum before wireworms oviposit can alleviate this problem (Weingartner et al. 1993). (1991) ...
... The commercial activities of plant material have favoured the dispersal of both agents, 21 conducting to more diverse encounters between trichodorid species and virus isolates. When 22 field populations of trichodorids become viruliferous, they can persist infected for many years 23 (Harrison, 1977, Weingartner, 2001), being known to cause high economical losses and in 24 growing areas of susceptible crops (Mojathedi et al., 2000Mojathedi et al., , 2001 Weingartner, 2001), mainly 25 due to its difficult control (Ploeg & Decraemer, 1997). Presently, the difficulties of disease 26 management in fields already contaminated are related with the efficient virus survival strategy, 27 the inexistence of diverse crop cultivars TRV resistant, and the lack of efficient chemical 1 treatments, as nematicides do not eradicate the problem and have high environmental 2 containments upon their use. ...
... A wide variety of plant-parasitic nematodes are abundant in the area, but sting nematode (Belonolaimus longicaudatus) and the stubby-root nematodes, Paratrichodorus (Nanidorus) spp. and Trichodorus spp., are the most problematic (Perez et al., 2000;Crow et al., 2000b). Sting nematode is a very damaging pathogen of potato that stunts the root system, reducing tuber yield (Weingartner et al., 1993). ...
... This study showed that there were variations in DNA sequences among the populations of B. longicaudatus from turfgrasses. Differences in sequences of rDNA genes between B. longicaudatus populations were observed in previous studies (Cherry et al., 1997;Gozel et al., 2006;Han et al., 2006b;Cid del Prado Vera and Subbotin, 2012). In the phylogenetic trees using D2-D3 of the 28S rDNA and ITS1-5.8S-ITS2 ...
... Crop irrigation is facilitated by raising the shallow water table to just below the root zone, a practice termed seepage irrigation or subirrigation (Smajstrla et al., 2000;Way, 2007). There are approximately 323, 000 ha of crop land suitable to subirrigation in Florida (Dukes et al., 2010). ...
... of PLB infection, results proved that citric acid efficiency was equal to copper just in case of the tolerant cultivar Eden and susceptible cultivar Royal. The present findings are in agreement with Haynes et al. (1998) who reported that highly resistant and susceptible genotypes were the most stable but that some of the intermediate clones were less stable. ...
... Dry rot evaluations were done with tubers washed, inoculated and stored according to procedures outlined by Corsini and Pavek (1986). Late blight (Phytophthora infestans) field evaluations were conducted at Corvallis, OR, as described by Mosley et al. (2003) and in the National Late Blight Germplasm Evaluation Trials as described by Haynes et al. (2002). Potato leafroll virus (PLRV) necrosis screening was done at Kimberly, ID, by planting a spreader row on the borders of the plots (3 replicates, RCB) and allowing aphids to move the virus into the plots from PLRV infected units within the spreader rows. ...
... Several studies have documented the advantage of using lower concentrations than the standard. Locascio et al., (1992) showed that the quality of chipping potatoes decreased with excessive potassium. Zheng et al., (2005) and Rouphael et al., (2008) proved that nutrient solution concentration used by growers can be reduced by 50% without any adverse effect on biomass and quality parameters in geranium and gerbera, respectively. ...
... TRV is of economic importance to potato production as it causes the disease, corky ringspot, that is characterized by deformation, concentric arcs or rings, necrotic and brown Edited by Karel Petrzik. spots in the tuber flesh [6]. The disease reduces the quality of potato tubers and results in rejection of affected lots. ...