CIM22EAPP1-02-18

CIM22EAPP1-02-18 is an early-maturing, high-yielding, white maize hybrid with drought tolerance, nitrogen-use efficiency, and resistance to GLS, TLB, ear rots, and rust. It is notable for good grain yield, MLN resistance, good seed parent yield, and earliness.    General Information   Target region Eastern Africa   Adaptation/Agroecological zone 1000-1600 masl   Type of product Three-way cross   Year first announced 2024         Why farmers say they like it*       High yield, good husk, strong stems Grain Yield   Grain yield (Opt) 6.84 t/ha   *Common keywords from farmer feedback (EA-ROFT 2023-1A) Grain yield (RS) 2.73 t/ha       Grain yield on-farm >3 t/ha* 5.79 t/ha   Kernel Characteristics Grain yield on-farm < 3 t/ha** 1.55 t/ha   Kernel color White Grain yield under low N 2.77 t/ha   Kernel texture Semi-dent Grain yield under MD 4.26 t/ha       Grain yield under FAW (AI) 4.13 t/ha   Biotic Stress Performance Grain yield under GLS (AI) 7.47 t/ha   MLN (AI) (1-9)* 3.02 Grain yield under TLB (AI) 6.17 t/ha   Grey leaf spot (GLS) (AI) (1-9)* 2.86 Grain yield under MLN (AI) 8.28 t/ha   Common rust (nat) (1-9)* 2.89 *Average of ROFT sites where grain yield was greater than 3 t/ha
**Average of ROFT sites where grain yield was less than or equal to 3 t/ha   Turcicum leaf blight (TLB) (AI) (1-9)* 3.60   Maize Streak Virus (MSV) Resistant allele present   Ear rots 4.0%       *Diseases are scored on a 1-9 scale, where 1 = Highly resistant; 5 = Tolerant; 9 = Highly susceptible. Agronomic Characteristics   Maturity group Early       50% anthesis 66.6 days   Seed Production Characteristics (798 GDD)   SC female parent yield 8.86 t/ha Anthesis-silking interval  0.94 days   Male parent yield 1.89 t/ha Farmers' score* 2.91   Nicking 4.1 days Ear height  101 cm       Plant height  229 cm   Comments Ears per plant 0.99   Product information is based on data from CIMMTY's Eastern Africa 2022 Stage 4 (CIM22EAPP1B-RT) and 2023 Stage 5 (EA-ROFT 2023-1B) Trials. 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
Opt = Optimal management
ROFT = Regional On-Farm Trials
RS = random stress
SC = single-cross
TLB = Turcicum Leaf Blight Bad husk cover 6.6%   Ear aspect (1-5)** 2.57   Plant aspect (1-5)** 2.64   Root lodging 3.8%   Stalk lodging 2.9%   *Farmers' Score is based on a 1-5 scale where 1 = most preferred and 5 = least preferred
**Plant and ear aspects are scored on 1-5 scale, where 1 = desirable and 5 = undesirable characteristics               Further Links   Full Product Announcement
(including trial results summary and site information)