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  • Author or Editor: James F. Price x
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The sweetpotato whitefly, Bemisia tabaci (Gennadius), was associated with symptoms of a silverleaf disorder of acorn squash (Cucurbita pepo L. cvs. Table King Bush and Table Ace) in cage studies in the greenhouse. Symptoms appeared on uninfested leaves that developed after plants were infested with the whitefly. When the infested lower leaves were removed and the young leaves protected from infestation with insecticides, new growth was asymptomatic or nearly so and symptomatic leaves remained symptomatic. Symptom expression was related more to nymphal density than to adult density since the relationship between log nymph density and symptoms was linear when adult densities were equal.

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Abstract

After 4 weeks indoors, ‘Annette Hegg Dark Red’ (‘AHDR’) and ‘Gutbier V-14 Glory’ (‘GV14’) had higher leaf abscission than ‘Mikkel Improved Roch-ford’ (‘MIR’). ‘AHDR’ abscised more bracts than ‘MIR’ or ‘GV14’. Plant grade was highest for ‘GV14’. Fritted Trace Elements-treated (FTE) and Micromax-treated (MICROMAX) plants lost fewer leaves and bracts and had a higher plant grade than Perk-treated (PERK) or Soluble Trace Element Mix-treated (STEM) plants. Plants held in dark storage for 3 or 6 days had greater leaf abscission than plants not subjected to storage. Bract drop was highest for 6 days storage. Dark storage of 0 or 3 days had higher plant grade than 6 days dark storage.

Open Access

Abstract

Sleeved poinsettia plants (Euphorbia pulcherrima, Willd. cv. Gutbier V-14 Glory) had less abscission and damaged bracts and maintained better long-term postharvest quality 30 days after treatment than did nonsleeved plants. Plants had better quality after 30 days in the postharvest environment when the storage temperatue was 12.8°C as opposed to 7.2° or 18.3°. The longer storage durations of 6 or 9 days resulted in plants with greater abscission and lower quality for the 30-day postharvest period than the 3-day storage duration.

Open Access

Abstract

Plant width and bract color were greater after the production period for ‘Annette Hegg Dark Red’ and ‘Gutbier V-14 Glory’ poinsettia (Euphorbia pulcherrima Willd. ex Klotzsch) when fertilized with Osmocote 14N-6.1P-11.6K than Osmocote 18N-2.6P-10K. Plant height, width, bract color, foliar color, and plant quality increased as fertilizer rates increased from 3 to 9 g/pot. Plants fertilized with 14N-6.1P-11.6K had the least bract loss, greater fresh weight, and the best plant quality after the 30-day postharvest period. Poinsettias fertilized with the lowest rate of 3 g/pot and held for the shortest storage duration had the least leaf, bract, and cyathium loss and highest fresh weight and plant quality. Plants illuminated with the incandescent (INC) light source had the lowest leaf loss and highest fresh weight when compared to cool-white fluorescent (CWF).

Open Access

Abstract

Euphorbia pulcherrima Willd. cvs. Mikkel Improved Rochford (MIR), Annette Hegg Dark Red (AHDR), and Gutbier V-14 Glory (GV14) were subjected to 2 storage methods (24 hours/day light or 24 hours/day darkness) for 2, 4, 6, or 8 days, and then held for a 14-day postharvest evaluation period in the greenhouse. Light-stored MIR and AHDR plants had a lower leaf drop but a higher cyathium drop as compared to dark-stored plants. GV14 was unaffected by storage methods. All cultivars retained better postharvest quality when stored for a minimal duration of time.

Open Access

The use of locally grown transplants in Florida strawberry (Fragari×ananassa Duchesne) production has increased since the release of the cultivar Sweet Charlie by the University of Florida in 1992. Previous research has shown that nursery region can influence production patterns of other strawberry cultivars through differences in photoperiod and temperature exposure. Transplants of `Sweet Charlie' strawberry (bareroot and plug plants) from sources representing northern (Canada, Massachusetts, Oregon), southern (Alabama, Florida) and mid latitude (North Carolina) transplant production regions were compared for plant vigor, production, and pest incidence at Dover, Fla. in 1995-96 and 1996-97. Total fruit production was not significantly different forplants among the plant source regions in 1995-96, but total yield from southern source plants in 1996-97 was significantly lower than northern and mid latitude plant sources. Monthly production of marketable fruits varied among the three plant source regions in December, January, and February, during which time market prices fell 46% in 1995-96 and 56% in 1996-97. Plants from northern and mid latitude sources produced significantly greater fruit yield in December than plants from southern sources. Differences among plant sources were detected for early flowering, initial crown size, incidence of foliar disease, arthropod pests, mortality, and fruit weight. Geographic location of strawberry transplant sources influenced fruiting patterns and other components that may affect profitability of `Sweet Charlie' strawberry production in west central Florida.

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To our knowledge, there has been no published technique to produce consistently high-quality slides of somatic chromosomes of roses (Rosa sp.). Therefore, various pretreatments, fixatives, digestions, stains, and maceration and squashing methods were tested to identify a procedure to produce clear, well-spread chromosomes from shoot tips. The best results were obtained after pretreatment in a mixture of 0.1% colchicine and 0.001 m 8-hydroxyquinoline for 4 h, and fixation in 2 acetone: 1 acetic acid (v/v) with 2% (w/v) polyvinylpyrrolidone. The darkest-stained chromosomes were obtained with carbol-fuchsin staining of air-dried cell suspensions that had been spread in 3 ethanol: 1 acetic acid (v/v).

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