| CIM21EAPP1-01-22 is an intermediate-maturing, high-yielding, white maize hybrid with exceptional drought tolerance, nitrogen-use efficiency, and resistance common foliar and ear diseases i.e GLS, TLB and ear rots. It is suitable for tropical mid-altitude production environments. |
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General Information |
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Target region |
Eastern Africa |
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Adaptation/Agroecological zone |
600-1500 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) |
7.86 t/ha |
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Big cobs, good husk cover, strong stem |
| Grain yield on-farm |
6.04 ± 2.23 t/ha |
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| Grain yield (RS) |
5.12 t/ha |
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*Common keywords from farmer feedback (EA-ROFT 2022-1A) |
| Grain yield under low N stress |
2.86 t/ha |
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| Grain yield under managed drought |
3.01 t/ha |
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Kernel Characteristics |
| Grain yield under FAW (AI) |
6.20 t/ha |
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Kernel color |
White |
| Grain yield under MLN stress (AI) |
2.91 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 |
Intermediate |
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MLN (AI) (1-9)* |
5.2 |
| 50% anthesis |
72 days |
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Grey leaf spot (GLS) (AI) (1-9)* |
2.0 |
| (742.6 GDD) |
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Turcicum leaf blight (TLB) (AI) (1-9)* |
2.9 |
| Anthesis-silking interval |
-0.1 days |
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Common rust (nat.) (1-9) |
2.1 |
| Ear height |
135 cm |
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Ear rots (nat.) |
2.9% |
| Plant height |
255 cm |
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*Diseases are scored on a 1-9 scale, where 1 = Highly resistant; 5 = Tolerant; 9 = Highly susceptible. |
| Ears per plant |
1.03 |
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| Bad husk cover |
9.9% |
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| Ear aspect (1-5)* |
2.7 |
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Seed Production Characteristics |
| Plant aspect (1-5)* |
2.6 |
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SC female parent yield |
7.1 |
| Root lodging |
6.5% |
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Male parent yield |
2.4 |
| Stalk lodging |
3.3% |
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Nicking |
1.2 |
| Farmer score** |
2.11 |
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| *Plant and ear aspects are scored on 1-5 scale, where 1 = desirable and 5 = undesirable characteristics |
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Comments |
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Product information is based on data from CIMMYT's East Africa 2021 Stage 4 (CIM21EAPP1A-RT) and 2022 Stage 5 (EA-ROFT 2022-1A) 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 pressure/infestation
NUE = Nitrogen-use efficient
RS = random stress
SC = single-cross
TLB = Turcicum Leaf Blight |
| ** 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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