| (Common tomato: Lycopersicon lycopersicum) (Currant tomato: Lycopersicon pimpinellifolium) CULTURE: Sow seeds 6 weeks before the last frost date for your area. Plant seed 1/4 inch deep in shallow flats and maintain soil temperature in the range of 75-85 deg. F (24-29 deg. C) for good germination. When the seedlings have produced several leaves, transplant to 3" pots to promote root growth. After transplanting, keep seedlings at a lower temperature at night, 50-60 deg.F (10-13 deg.C), to promote earlier flowering in some varieties. Day temperatures should rise to 75-85 deg. F (24-29 deg. C) to promote rapid growth. Expose plants to light and air currents to harden the plants and to encourage stockiness. Water sparingly, but do not allow the growth to become checked. Fertilize with complete, soluble fertilizer or fish emulsion if leaves become yellow and/or purple. Keep phosphorous levels high. Too much nitrogen will delay fruiting. For transplanting to the garden, average soil temperature should be 60-65oF (16-18 deg. C). SPACING: Staked plants should be spaced about 18 to 24" apart. Caged plants should be spaced about 24 to 36" apart. DISEASES: Early determinate varieties generally have poor disease resistance; however, disease is not usually a problem until mid-season. Plant disease-resistant varieties for a sustained harvest. Leaf blight diseases such as early blight and alternaria begin to appear about mid-July, and plants are more susceptible once fruit production begins. To reduce disease problems, use resistant or tolerant varieties and rotate tomatoes to different parts of the garden each year, using a three-year rotation. Fusarium wilt (race 1), a disease caused by a soil fungus, is common in the Mid-Atlantic region during mid- to late-season. Fusarium races 1 and 2 are present in southern regions. Where fusarium wilt is present a six-year rotation or use of resistant varieties is recommended. Do not plant eggplants, peppers, or potatoes in wilt-infested soil during the rotation period. Avoid planting tomatoes near walnut trees to avoid "walnut wilt". Early blight and anthracnose are common in the Mid-Atlantic region, and are favored by hot, humid conditions. Late blight is more common in inland regions at higher elevations, especially during the spring and fall. Blossom-end rot is prevented by ensuring an adequate level of soil calcium, and steady moisture. PESTS: Tomato hornworms can be controlled by Dipel. Hornworms with the white egg cases of parasitic wasps should not be destroyed because the wasps will hatch out and destroy other hornworms in your garden. FLAVOR: Type of fertilizer used has an effect on flavor. Highly flavored tomatoes are sometimes subject to "off flavors" under certain growing conditions. Avoid placing freshly harvested tomatoes in the refrigerator because refrigeration will destroy much of the delicate flavor. Tomatoes are best stored at a temperature above 50 deg. F (10 deg. C). ACIDITY: Yellow and white tomatoes are not necessarily low acid. They tend to have a high sugar content that masks the acidity. SEED SAVERS: Isolate varieties of L. lycopersicon by a minimum of 35' for home use and 75' to 150' for pure seed. Isolate varieties of L. pimpinellifolium species from all other tomato species by a minimum of 150'. MATURATION DATES: Days to maturity are the number of days after transplanting. PACKET: Seed size varies considerably, 0.08 to 0.16 g (about 40 to 83 seeds, depending on variety, average 64 seeds) sows 100'. SEEDS/OZ: 7000 to 15,000 seeds/oz. (average 11,500) sows 3/4 to 1-1/2 acre of transplants at 18" spacing in rows 4' apart. |