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  • Author or Editor: Randy C. Ploetz x
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Abstract

Net CO2 assimilation (A) and stomatal conductance for CO2 (gs) were determined for flooded and nonflooded avocado plants (Persea americana Mill.) with different severities of phytophthora root rot (caused by Phytophthora cinnamomi Rands). Under nonflooded conditions, root necrosis (primarily due to P. cinnamomi) of <50% generally had little effect on net gas exchange, whereas root necrosis ≥50% resulted in decreases in A and gs of up to 65% when compared to noninfested controls. However, root necrosis ≥20% greatly reduced A and gs when plants were flooded for 7 days. Net CO2 assimilation and gs were not reduced when plants without root rot were flooded for 7 days.

Open Access

In 1995, 37 new dessert and cooking bananas (Musa spp.) were introduced into South Florida for evaluation under local edaphic and environmental conditions. The number of pseudostems per mat, height at fruiting, and cycling time were determined during the first fruiting cycle, and bunch number and bunch weight were recorded from 1996 to 1998. A productivity index (PIX), calculated as 100 × mean bunch weight in kg/cycling time in days, was used to determine the productivity of the clones over time. Informal taste panels assessed the appearance and organoleptic qualities of fruit on a subjective 1 to 4 scale. In a separate experiment, the susceptibility of 30 of the clones to fusarium wilt, caused by Fusarium oxysporum f. sp. cubense, was assessed. Some of the most popular and productive clones were susceptible to fusarium wilt and are not recommended for production in areas that have a history of this disease. The dessert clones `Pisang Ceylan', FHIA01', FHIA02', and FHIA17' and the cooking accessions `Kandrian', `Kumunamba', and `Saba' resisted fusarium wilt, produced moderate to high yields (PIXs ≥ 1) of good to excellent fruit (mean ratings ≥ 3), and are recommended for use in all areas in Florida.

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