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| ACCESSION | PLANT NAME | TAXONOMY | ORIGIN | GENEBANK | IMAGE | AVAILABILITY | RECEIVED | SOURCE TYPE | SOURCE DATE | COLLECTION SITE | COORDINATES | ELEVATION | HABITAT | IMPROVEMENT LEVEL | NARRATIVE | | |
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| 0 | PI 608777 | B85 | Zea mays L. subsp. mays | Iowa, United States | NC7 |  | | 1992 | DEVELOPED | | | | | | Breeding material | Inbred B85 is a yellow dent inbred line developed from BSCB6(S)C3. BSCB6 (PI 550453 registered in Crop Sci.11:140-141) was first designated Iowa Corn Borer Synthetic No. 6. BSCB6(S)C3 was developed from Pennsylvania Early Synthetic by three cycles of recurrent selection based on S1 line resistance to leaf feeding by the European corn borer (Ostrinia nubilalis Hubner) (resistance to first brood of the European corn borer). B85 has an erect-leaf orientation and is single-eared. Pollen production is adequate and silks emerge 3 to 4 days after the first shedding of pollen. The date for silk emergence is 2 days earlier than A632. The ear is relatively small, with 12 to 14 kernel rows, and the seed is intermediate in size with a shallow dent. Inbred B85 is highly resistant to leaf feeding by first brood of the European corn borer; consequently, it is a good source of resistance in an early maturity breeding program. Evaluations in northern Iowa for 4 years have shown that the line contributes good yield and stalk strength to hybrids, but that it contributes poor root strength. Maturity classification is AES500. B85 was evaluated extensively and released because of potential value in breeding programs of the hybrid seed industry. | 1082040 | PI 608777 |
| 1 | PI 608778 | B86 | Zea mays L. subsp. mays | Iowa, United States | NC7 |  | | 1992 | DEVELOPED | | | | | | Breeding material | B86 is a yellow dent inbred line developed from the single cross, B52 x Oh43. Inbred Oh43 (Ames 19288) contributed leaf-feeding resistance to the European corn borer and B52 (PI 550454) contributed high resistance to sheath and collar feeding by the European corn borer after silk emergence (resistance to second brood of the European corn borer). B52 has also intermediate resistance to the first brood. Inbred B86 was developed by selection and self pollination in the ear-to-row system for the F3 to F5 generations. Artificial infestation of the corn borer was used in each generation, with separate nurseries for the first and second broods. Subsequent evaluations of B86 in two seasons with high level artificial infestations of the insect have shown that it is highly resistant to the first brood and nearly as resistant as B52 to the second brood. It is the first inbred stock of U.S. Corn Belt origin known to combine into one genotype good resistance to the insect for the life of the plant. Silk emergence is 1 to 2 days earlier than B52 or 5 to 6 days later than Oh43. Pollen production is satisfactory, and seed yield is good on an intermediate-sized ear. Limited evaluations in single crosses have shown that B86 contributes only average yield and root strength and that the stalks may be brittle. Maturity classification is late AES800. | 1082042 | PI 608778 |