CIM23EAPP3-42

CIM23EAPP3-42 is a late-maturing, high-yielding, maize hybrid adapted to highland agroecologies of eastern Africa, with white grain, with resistance to GLS, TLB, ear rot, rust and TLB.   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.) 9.80 t/ha   Why farmers say they like it* Grain yield under on-farm conditions 9.30 t/ha   High yielding, good grain texture and Ear aspect Grain yield under low N stress 3.20 t/ha   Grain yield (RS) 7.00 t/ha   *Common keywords from farmer feedback (CIM24ROFT-EA-PP3-01)           Agronomic Characteristics   Kernel Characteristics Maturity group Late   Kernel color White 50% anthesis 91.2 days   Kernel texture Semi-dent Anthesis-silking interval  1.70 days       Ear height  135.7 cm   Biotic Stress Performance Plant height  265.1 cm   Grey leaf spot (GLS) (nat.) (1-9)* 3.7 Ears per plant 1.30   Turcicum leaf blight (TLB) (nat.) (1-9)* 4.0 Bad husk cover 3.32%   Rust (nat.) (1-9)* 2.7 Ear aspect (1-5)* 2.60   Ear rots 3.13% Root lodging 6.50%   *Diseases are scored on a 1-9 scale, where 1 = Highly resistant; 5 = Tolerant; 9 = Highly susceptible. Stalk lodging 5.90%   *Plant and ear aspects are scored on 1-5 scale, where 1 = desirable and 5 = undesirable characteristics         Seed Production Characteristics       SC female parent yield 10.1 t/ha Further Links   Male parent yield 2.7 t/ha Full Product Announcement
(including trial results summary and site information)   Nicking 0.9 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