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TwilleySeed-2017Catalog

Sweet Corn ... A Taste of Sunny Summer Selecting Sweet Corn Varieties Sweet Corn breeders have been working with many new genetic combinations affecting the sugars in sweet corn varieties, which in turn affects classification of varieties. So far, there has not been complete agreement about classifying various types. Twilley's research department continually looks at different varieties and how they perform. The following information will help clarify types listed by Twilley, so you can choose which variety is best for your sweet corn production. Homozygous Sugary Enhancer Gene Type (se) 100% of kernels are sugary enhanced. Each tasty kernel has higher sugar content than normal sugary types but has comparable levels of starch which contribute to its creamy texture and delicious corn flavor. The kernels also have a very tender pericarp. Isolation is suggested where complete uniformity of kernel type is needed. Primus F1 see pg 25 Normal Sugary Gene Type (su) The standard sweet corn for many years. Sweet, creamy kernels with tender skin best used immediately after picking; conversion of sugar to starch is rapid. Isolation not required. Silver Queen F1 see pg 27 SuperSeedWare® SSW® is a new and exciting breakthrough in super-sweet corn genetics. Developed and patented by Abbott & Cobb, SSW® 's are 100% natural. They have notable enhanced performance even with early plantings in colder or wetter soil. Growers can expect strong stalk and root systems, early maturity, better disease tolerance and high yields. SSW® 's also have dramatically improved seed storage and shelf life. Homozygous Shrunken 2 Gene Type (sh2) Sometimes referred to as super sweets, 100% of kernels contain 2 to 3 times the sugars of normal sugary types at peak harvest. Kernels are characterized by high sugar content, low water-soluble polysaccharides and crisp texture. Conversion of sugars to starch is much slower, allowing longer storage, long-distance shipping. Seed is lighter than other types of sweet corn so it has a higher seed count per lb. Because of the high sugar content, kernels have a shriveled appearance. When planting, please note that isolation is required. Super sweet varieties are particularly sensitive to soil temperature. Soil should be consistently warmer than 55° before sowing. These are the best varieties if more than 48 hours is required to get the corn to market. Examples of this group include Summer Sweet®, X-tra Sweet® and X-tra Tender®. Xtra-Sweet® Chieftain F1 see pg 23 Heterozygous Sugary Enhancer Gene Type (se+su) Many so-called se types fall into this category, with approximately 25% of the kernels on each ear being sugary enhanced. This gene provides about 15% higher sugars at peak harvest over normal sugary types. Best used immediately after picking. Conversion of sugar to starch is rapid. Isolation not required. Sweet Corn Soil temperature – If sown too early in the season, corn will not grow well. Wait until soil is over 55° F. Only treated seeds of cold-germinating varieties should be planted before that time. Planting – Full sun is necessary. Sow seeds 1" deep and space 6-7" apart. Rows should be approximately 32" apart. Untreated seed should be planted more densely. To ensure proper pollination, think "four": plant in blocks of at least four rows, each at least four feet long. Pests/Diseases – Conditions vary depending on location. For the best information regarding each region, we advise you to consult your local extension service. Harvest – Corn is ready to eat when the silk turns dry and dark brown and kernels are milky. Heterozygous Shrunken 2 Gene Type (sh2+se) Many sweet corn varieties have some super sweet parentage, giving them approximately 75% sugary enhanced (se) kernels and 25% shrunken 2 (sh2) kernels on each ear. Best used immediately after picking. Conversion of sugar to starch is rapid. Isolation is suggested where complete uniformity of kernel type is needed. Examples of this group include the Synergistics and TripleSweet™ Brand. Espresso F1 see pg 24 StaysRichGreen® is one of the new genetics by Abbott & Cobb. These varieties have extra dark green plants and husks, as well as thicker leaves that stay dark green even beyond full ear maturity and enhanced emergence and vigor. SRG®'s harvested ears maintain a rich green appearance and hold better for fresh market and retail displays, making them much more appealing to consumers. a note about isolation : The reason for isolating super sweet (sh2) types is the same as for isolating white from yellow corn, but more important because marketability of the ear is affected. The sh2 types are isolated to prevent cross pollination with normal sugary sweet corn or field corn. Isolate in one of three ways: by maturity (10 days to two weeks), by distance (100-150 ft. upwind), or by using a barrier planting. 20 Email: twilley@twilleyseed.com Fax: 864-227-5108


TwilleySeed-2017Catalog
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