CIM23EAPP3-40

CIM23EAPP3-40 is a late-maturing, high-yielding, white maize hybrid, with resistance to GLS, TLB, rust, and ear rots, bred for target agroecologies of the highlands of eastern Africa.   General Information   Target region Eastern Africa    Adaptation/Agroecological zone 1800-2400 masl   Type of product Three-way cross       Year first announced 2025 Grain Yield       Grain yield (opt.) 10.40 t/ha   Why farmers say they like it* Grain yield under on-farm conditions 9.20 t/ha   High yielding, good grain texture and husk cover Grain yield under low N stress 3.50 t/ha   Grain yield (RS) 6.3   *Common keywords from farmer feedback (CIM24ROFT-EA-PP3-01)           Agronomic Characteristics   Kernel Characteristics Maturity group Late   Kernel color White 50% anthesis 93.9 days   Kernel texture Semi-dent Anthesis-silking interval  2.0 days       Ear height  155 cm   Biotic Stress Performance Plant height  286 cm   Grey leaf spot (GLS) (nat.) (1-9)* 3.80 Ears per plant 1.30   Turcicum leaf blight (TLB) (nat.) (1-9)* 4.00 Bad husk cover 7.49%   Rust (nat.) (1-9)* 2.40 Ear aspect (1-5)* 2.80   Ear rots 2.95% Root lodging 7.0%   *Diseases are scored on a 1-9 scale, where 1 = Highly resistant; 5 = Tolerant; 9 = Highly susceptible. Stalk lodging 6.2%   *Plant and ear aspects are scored on 1-5 scale, where 1 = desirable and 5 = undesirable characteristics         Seed Production Characteristics       SC female parent yield 9.4 t/ha Further Links   Male parent yield 3.7 t/ha Full Product Announcement
(including trial results summary and site information)   Nicking -3.9 days             Comments       Product information is based on data from  the CIMMYT East Africa 2023 Regional Trial (CIM23RT-EA-PP3-01) and 2024 regional on‐farm trials (CIM24ROFT-EA-PP3-01). Actual performance will vary depending on a number of agronomic and environmental factors. 

Abbreviations:
AI = artificial infestation/inoculation
GDD = growing degree-days (°C)
GLS = Grey Leaf Spot
Low N = managed low nitrogen stress
masl = meters above sea level
nat. = natural infestation
opt. = optimum (44,444 plants per ha)
RS = random stress
SC = single-cross
TLB = Turcicum Leaf Blight