Sweet Corn ... A Taste of Summer Sunshine
Serendipity F1 see pg 25
Selecting Sweet Corn Varieties
Sweet Corn breeders have been working with many new genetic combinations affecting WKH VXJDUV LQ VZHHW FRUQ YDULHWLHV ZKLFK LQ WXUQ DIIHFWV FODVVLÀ FDWLRQ RI YDULHWLHV 6R 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 Shrunken 2 Gene Type (sh2 )
Summer Sweet 7930R F1
see pg 22
Sometimes referred to as super sweets, 100% of ker- nels 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® Sweet®
, X-tra Heterozygous Shrunken 2 Gene Type (sh2
and X-tra Tender® +se)
.
Many sweet corn varieties have some super sweet parentage, giving them approximately 75% sugary enhanced (se) kernels and 25% shrunken 2 (sh2
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 Á DYRU 7KH NHUQHOV DOVR KDYH D YHU\ WHQGHU SHULFDUS ,VRODWLRQ LV suggested where complete uniformity of kernel type is needed.
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 sug- ary types. Best used immediately after picking. Conversion of sugar to starch is rapid. Isolation not required.
) 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.
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-ger- minating 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 pol- lination, think "four": plant in blocks of at least four rows, each at least four feet long.
Pests/Diseases – Conditions vary depend- ing on location. For the best information regard- ing 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.
Silver Queen F1 see pg 28
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.
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 VK W\SHV DUH LVRODWHG WR SUHYHQW FURVV SROOLQDWLRQ ZLWK QRUPDO VXJDU\ VZHHW FRUQ RU ¿ HOG FRUQ ,VRODWH LQ RQH RI WKUHH ZD\V E\ PDWXULW\ GD\V WR WZR ZHHNV E\ GLVWDQFH (100-150 ft. upwind), or by using a barrier planting.
To Order Call: 800-622-7333 (USA) or 864-227-5150 (Int'l) 21
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