CIM21EAPP2-05

CIM21EAPP2-05 is a late-maturing, high-yielding, white maize hybrid with drought tolerance, moderate nitrogen-use efficiency, and high resistance to common foliar diseases GLS, TLB, ear rots and slight striga weed tolerance. The product is notable for its good husk cover, long ears, large kernel sizes and semi-flint grain.   General Information   Target region Eastern Africa   Adaptation/Agroecological zone 1300-2000 masl   Type of product Three-way cross   Year first announced 2023           Grain Yield   Why farmers say they like it* Grain yield (OPT) 8.60 t/ha   Big cobs, good husk cover, resistant to diseases Grain yield on-farm 6.95± 2.56 t/ha   Grain yield (RS) 3.03 t/ha   *Common keywords from farmer feedback (EA-ROFT 2022-1A) Grain yield under low N stress 1.90 t/ha       Grain yield under managed drought 2.45 t/ha   Kernel Characteristics Grain yield under FAW (AI) 3.40 t/ha   Kernel color White Grain yield under striga stress 2.48 t/ha   Kernel texture Semi-flint           Agronomic Characteristics   Biotic Stress Performance Maturity group Late   Grey leaf spot (GLS) (AI) (1-9)* 2.6 50% anthesis 80 days   Turcicum leaf blight (TLB) (AI) (1-9)* 4.0 (798.0 GDD)   Common rust (nat.) (1-9) 2.1 Anthesis-silking interval  1.0 days   Ear rots (nat.) 6.3% Ear height  129 cm   *Diseases are scored on a 1-9 scale, where 1 = Highly resistant; 5 = Tolerant; 9 = Highly susceptible. Plant height  254 cm   Ears per plant 1.08       Bad husk cover 5.0%   Seed Production Characteristics Ear aspect (1-5)* 2.6   SC female parent yield 7.12 t/ha Plant aspect (1-5)* 2.7   Male parent yield 2.83 t/ha Root lodging 5.9%   Nicking -4.1 days Stalk lodging 12.1%       Farmer score (1-5)** 2.55   Comments *Plant and ear aspects are scored on 1-5 scale, where 1 = desirable and 5 = undesirable characteristics   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   ** Farmer scores are based on a 1 to 5 scale where 1 = very good, 2 = good, 3 = mediocre, 4 = bad, 5 = very bad           Further Links   Full Product Announcement
(including trial results summary and site information)