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Evaluation and Yield Trials of Tomatillo in New Hampshire

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VARIETY TRIALS varied from 18.0 to 38.3 g (0.6 to 1.3 do not know the origin of the other oz). PI 197691 and PI 270459 cultivars. Additionally, the USDA–ARS performed better than some of the Plant Genetic Resources Unit at commercial cultivars indicating their Geneva, N.Y., which holds the entire potential to be used as germplasm for collection of Physalis in the United breeding. A basket-weave trellising system which kept plants upright was States, lists several P. ixocarpa acces- tested. This made harvest easier and sions. The objectives of our study were Variety to evaluate and conduct yield trials of potentially can be used for tomatillo culture. tomatillo cultivars and available germ- plasm during the 1997 and 1998 grow- ing seasons in New Hampshire. Re- Trials omatillo or husk tomato is sults of an observation plot using a a herbaceous annual with basket-weave trellising system are also Tindeterminate growth habit. It reported. is native to Central America where it is claimed that there is no acceptable Materials and methods substitute in making green sauce or 1997 EXPERIMENT. On 1 May Evaluation and salsa verde (Saray-Meza et al., 1978). 1997, five tomatillo cultivars from com- Yield Trials of Three species of the genus Physalis mercial seed companies (‘Tomatillo’, have edible fruit with higher contents ‘Puebla Verde’, ‘De Milpa’, ‘Toma Tomatillo in New of protein, ascorbic acid, nicotinic acid Verde’ and ‘Tomatillo Purple’) and 23 and solids than tomato (Yamaguchi, Physalis accessions were sown at the Hampshire 1983). Physalis peruviana L. (cape University of New Hampshire research gooseberry, uchuba) and P. pruinosa greenhouses. Each genotype was sown L. (ground cherry, husk tomato) are in a six-pack plug tray using Pro-mix 1 Rosanna Freyre and used as juice and jam fruit; P. ixocarpa BX soilless medium (Premier Horti- J. Brent Loy2 is used as a vegetable or for sauces. culture Ltée. Rivière-du-Loup, Tomatillo is adaptable to growing con- Québec, Canada). Three seeds were ditions in northern latitudes and has sown in each cell except where germi- SUMMARY. Five tomatillo (Physalis potential commercial value due to the nation rate was indicated to be low, in ixocarpa Brot. ex Hornem) cultivars increased popularity of Mexican food which case up to 10 seeds per cell were available from commercial seed in the United States. In New Hamp- used. The trays were put under mist companies (‘De Milpa’, ‘Puebla shire, most locally grown vegetables watering in a greenhouse held at 21oC Verde’, ‘Purple Tomatillo’, ‘Toma- are sold retail through roadside stands (70oF). When most of the seeds per tillo’ and ‘Toma Verde’) and four and farmers’ cooperative markets. Small tray germinated, the trays were moved Physalis L. accessions (PI 197691, PI farmers can profit from diversification into a greenhouse held at 17 oC (63 oF) 270459, PI 291560, and PI 309812) and production of specialty crops such and plants were thinned to one per were grown in 1997 and 1998 at Kingman Research Farm, Durham, as tomatillo. cell. N.H. Three manual harvests per plot There have been studies on tax- Genotypes were transplanted to were performed each year, recording onomy and genetics (Menzel, 1951, the field at the Kingman Research data of total fruit weight, number of Waterfall 1967, Quiros, 1984), self- Farm, Durham, N.H., on 6 June to a fruit and average fruit weight for each incompatibility (Pandey, 1957), and plot with 3% to 8% slopes and Hollis- genotype. There were statistically development and growth of tomatillo Charlton fine sandy loam (Charlton = significant differences between (Cartujano-Escobar et al., 1985a, coarse-loamy, mixed, mesic Entic tomatillo genotypes for all three 1985b; Mulato-Brito et al., 1985). In Haplorthods; Hollis = loamy, mixed, traits. Statistically significant differ- Mexico many tomatillo cultivars are mesic Entic Lithic Haplorthods). This ences between the 2 years were found unnamed and considered criollas (na- plot had been broadcast-fertilized with for fruit number and average fruit tive) and there are few named culti- 15N–6.6P–12.5K at a rate of 960 weight per genotype. Over both years, –1 total fruit weight varied from 29.7 to vars: ‘De Milpa’, with small and tart kg·ha (857 lb/acre) according to soil 63.7 t·ha–1 (13.3 to 28.4 ton/acre). fruit, and ‘Rendidora’, developed by tests. Black plastic polyethylene mulch Fruit numbers per plant varied from mass selection and having 35% of the and drip irrigation (T-TAPE TSX, 83 to 330, and average fruit weight total production in the country (Saray- Rainflow Irrigation, East Earl, Pa.; 8 Meza et al., 1978). In the United mil [0.008 inch (0.2 mm]; emitters 20 New Hampshire Agricultural Experiment Station sci- States, studies on field production of cm (7.9 inches) apart) were used, with entific contribution 2043. We thank Charles Bornt, tomatillo were performed in Louisiana 1.8-m (6-ft) spacing between rows, Kim Milbert, and Vikki Rodgers for technical assistance and 0.6-m (2-ft) spacing between and many students who helped during harvests. The (Moriconi et al., 1990) using seeds cost of publishing this paper was defrayed in part by the from a single fruit (cultivar name not plants. Two replicated plots of 10 plants payment of page charges. Under postal regulations, mentioned). We have found five toma- per genotype in a completely random- this paper therefore must be hereby marked advertise- ment solely to indicate this fact. tillo cultivars available from commer- ized design were used. Manual har- vests were performed continuously 1Research Assistant Professor, Dept. Plant Biology, cial seed companies in North America. University of New Hampshire, Durham, NH 03824. ‘Rendidora’ was discontinued in the from 20 Aug. to 25 Sept. 1997. A total 2Professor, Dept. Plant Biology, University of New seed market before 1991 (Whealy, of three harvests per plot were per- Hampshire, Durham, NH 03824. 1992), and other than ‘De Milpa’, we formed. After the first harvest, five of 374 ● April–June 2000 10(2) Table 1. Twenty-eight Physalis accessions and tomatillo cultivars grown in 1997 in New Hampshire. Origin or Accessionz Species seed company G 30151 P. ixocarpa Mexico G 30152 P. ixocarpa Mexico G 30711 P. ixocarpa Mexico G 31141 P. sp. Ecuador PI 194590 P. sp. Guatemala PI 197691 P. sp. Mexico PI 197692 P. sp. Mexico PI 203924 P. sp. Mexico PI 232077 P. peruviana (Cape gooseberry) Namibia PI 270459 P. ixocarpa Mexico PI 285705 P. peruviana (Peruvian groundcherry) Poland PI 290968 P. ixocarpa Argentina PI 291560 P. ixocarpa India PI 291561 P. peruviana India PI 309812 P. sp. Mexico PI 360740 P. ixocarpa USA PI 512005 P. ixocarpa Mexico PI 512006 P. ixocarpa Mexico PI 512007 P. ixocarpa Mexico PI 512008 P. ixocarpa Mexico PI 512009 P. ixocarpa Mexico PI 512010 P. ixocarpa Mexico PI 512011 P. ixocarpa Mexico P. ixocarpa (Tomatillo) Burpeey P. ixocarpa (Tomatillo Puebla Verde) Gurney’sx P. ixocarpa (Tomatillo De Milpa) Johnny’sw P. ixocarpa (Tomatillo Purple) Johnny’s P. ixocarpa (Tomatillo Toma Verde) Johnny’s zAccessions obtained from Plant Genetic Resource Unit (Geneva, N.Y.). yW. Atlee Burpee and Co., Warminster, Pa. xGurney’s Seed and Nursery Co., Yankton, S.D. wJohnny’s Selected Seeds, Albion, Maine. the Physalis accessions were selected, lb/acre) according to soil tests. Two An observation plot of 10 plants of based on high yields, for subsequent replicated plots of 10 plants per geno- ‘Tomatillo’ with a basket-weave trellis harvests along with the commercial type in a completely randomized de- using stakes and twine (Konsler and tomatillos. Two of selected accessions sign were used. Spacing between plots Gardner, 1990) was included in the were listed as P. ixocarpa (PI 270459 was increased to 2.4 m (8 ft). We 1998 experiment. This plot was har- and PI 291560), and the other three selected five plants per genotype and vested three times along with the other (PI 197691, PI 197692, and PI recorded the date of first open flower, plots, and the time required to harvest 309812) had no species identified. growth habit (40 d after transplant), was recorded. The rest of the accessions were found mature fruit colors and fruit shape to have very small yields and no com- (three fruit per plant), and fruit diam- Results and discussion mercial value. eter (measured on 10 fruit per plant GROWTH AND DEVELOPMENT. The 1998 EXPERIMENT. In 1998, five using digital calipers). Three manual 28 Physalis genotypes grown in 1997 commercial tomatillo cultivars plus the harvests per plot were performed be- are listed in Table 1. Plants grew very five selected Physalis accessions were tween 26 Aug. and 29 Sept. 1998. vigorously, eventually covering the sown on 30 Apr. at the University of During both years, data were re- space between rows. The only pest New Hampshire research greenhouses. corded on total fruit weight and num- problem encountered was northern The accession PI 197692 had a very ber of fruit per plot. Total fruit weight corn rootworm (Diabrotica barberi low germination rate and did not have was extrapolated to yield per hectare. Smith & Lawrence) early in the season enough plants for field transplant. On Average fruit weight was calculated. which was controlled with an applica- 4 June a total of nine genotypes were Analyses of variance of total yield, fruit tion of carbaryl as a 10% dust. Most transplanted to the field at the Kingman number and average fruit weight per genotypes had indeterminate growth Research Farm into black plastic mulch plant over both years were performed habit which became prostrate by the on 15-cm (6-inch) raised beds fitted using SAS (SAS Institute Inc., 1990).
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