| CIM21EAPP2-01 is a late-maturing, very high-yielding, white maize hybrid with drought tolerance, moderate nitrogen-use efficiency, and resistance to common foliar diseases such as GLS, TLB, common rust as well as ear rots. The product is notable for being prolific, with long cobs, good husk cover and large, semi-flint grains. |
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General Information |
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Target region |
Eastern Africa |
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Adaptation/Agroecological zone |
1300-2000 masl |
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Type of product |
Three-way cross |
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Year first announced |
2023 |
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| Grain Yield |
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Why farmers say they like it* |
| Grain yield (OPT) |
9.83 t/ha |
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Good husk cover, no lodging |
| Grain yield on-farm |
6.94± 3.13 t/ha |
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| Grain yield (RS) |
3.08 t/ha |
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*Common keywords from farmer feedback (EA-ROFT 2022-1A) |
| Grain yield under low N stress |
1.89 t/ha |
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| Grain yield under managed drought |
2.53 t/ha |
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Kernel Characteristics |
| Grain yield under FAW (AI) |
4.12 t/ha |
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Kernel color |
White |
| Grain yield under striga stress |
2.24 t/ha |
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Kernel texture |
Semi-flint |
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| Agronomic Characteristics |
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Biotic Stress Performance |
| Maturity group |
Late |
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Grey leaf spot (GLS) (AI) (1-9)* |
2.5 |
| 50% anthesis |
81 days |
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Turcicum leaf blight (TLB) (AI) (1-9)* |
3.0 |
| (793.5 GDD) |
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Common rust (nat.) (1-9) |
2.3 |
| Anthesis-silking interval |
1.0 days |
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Ear rots (nat.) |
6.6% |
| Ear height |
140.2 |
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*Diseases are scored on a 1-9 scale, where 1 = Highly resistant; 5 = Tolerant; 9 = Highly susceptible. |
| Plant height |
263.8 |
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| Ears per plant |
1.3 |
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| Bad husk cover |
4.7% |
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Seed Production Characteristics |
| Ear aspect (1-5)* |
2.5 |
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SC female parent yield |
8.82 t/ha |
| Plant aspect (1-5)* |
2.6 |
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Male parent yield |
3.26 t/ha |
| Root lodging |
6.7% |
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Nicking |
0.4 days |
| Stalk lodging |
6.8% |
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| Farmer score (1-5)** |
2.33 |
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Comments |
| *Plant and ear aspects are scored on 1-5 scale, where 1 = desirable and 5 = undesirable characteristics |
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Product information is based on data from CIMMYT's East Africa 2021 Stage 4 (CIM21EAPP2-RT) and 2022 Stage 5 (EA-ROFT 2022-P2) Trials. MSV tolerance is based on presence of genetic markers for MSV resistance.
Actual performance will vary depending on a number of agronomic and environmental factors.
Abbreviations:
AI = artificial infestation/inoculation
FAW = fall armyworm
GDD = growing degree-days (°C)
GLS = Grey Leaf Spot
Low N = managed low nitrogen
masl = meters above sea level
MLN = maize lethal necrosis
MSV = maize streak virus
nat. = natural infestation
NUE = Nitrogen-use efficient
RS = random stress
SC = single-cross
TLB = Turcicum Leaf Blight |
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| ** Farmer scores are based on a 1 to 5 scale where 1 = very good, 2 = good, 3 = mediocre, 4 = bad, 5 = very bad |
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| Further Links |
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Full Product Announcement
(including trial results summary and site information) |
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