Canela Russet( AC 92009-4RU )

Description
Tuber Shape Oblong to long
Eyes Shallow evenly distributed eyes
Skin Smooth medium cinnamon colored russet
Flesh White
Plant Medium sized semi-erect vine with white flowers

Released by Colorado State University, Canela Russet is an Medium-maturing, fresh market variety with a very high percentage on US # 1 tubers and a tight optimal size porfile. Canela Russet is resistant to tuber external defects, hollow heart and blackspot bruise. Canela russet is also resistant to powdery scab of the tuber and root galls, pink rot, and PVy and leaf roll viruses. It has a very long dormancy for long term storage. Canela's need low input amounts of nitrogen fertilizer. It s weakness is susceptibility to fusarium dry rot if tubers are not properly cured at harvest.



Plant/root Plants emerge slowly and produce a vine that is medium and semi-erect. A deep spreading root system helps provide adequate water and nutrient uptake for the large vines.

Tubers have white flesh and are oblong to long with a light cinnamon colored russet skin. Eyes are shallow and well distributed. A high percentage of tubers have an attractive long-type shape.

Yield potential 400 cwt. range with a high percentage of No. l's and tight optimal tuber size profile.

GROWING SEASON MANAGEMENT

Pre-planting considerations Tubers have a long dormancy; either single drop or cut seed is acceptable, but cut seed is preferable. Germination tends to be uniform, regardless of eye location on the tuber. When cutting seed apply appropiate fungicides as Canelas are susceptible to fusarium dry rot. Plant this cultivar 2 to 4 inches deep. It is very important to adequately warm the tubers before planting or emergence will be delayed. This is one of the key practices for this variety. Warming tubers at 50 degrees F for two weeks prior to planting is normal. Seed should be peeping at planting, but don't let sprouts get big enough to knock off at planting or emergence delays will result.

Fertility (soil test basis; lbs/acre)

Apply total fertilizer in the following range: N(140-160#), P(80-190#), K(0-200#). Performance in alkaline soils is good. Pre-plant incorporated N should be 80 to 90#. Save the rest of the fertilizer till plants tuberize. Sprinkler applied N should be 60 - 80# applied at a rate of 20# per application. Late fertilizer can affect skin set and result in storage problems and more fusarium dry rot problems in tubers. Cutting nitorgen off in time for a good skin set is the other key practice for this variety.

Irrigation Irrigation interval at the maximum ET is 3 days. Drought tolerance is good. Late season be very careful not to overwater them as water use drops fast.

Pest Control

Weeds Competition against weeds is good with no major herbicide sensitivities known. Insects Standard insect control measures generally are effective, but must be applied in a timely manner.

Fungicides Control of foliar early blight usually is accomplished with three fungicide applications, Early blight tolerance is good.

Tuber/bulking Tubers set in the middle of the hill. Plant sets an average of 7 to 9 tubers/plant. Tuber bulking occurs evenly thoughout the later part of the season.. Tubers are resistant to hollow heart, secondary growth, and blackspot bruises. Tubers are sensitive to shatter bruise so care should be taken during harvest. An oxidizer appliedd to the tubers at harvest can help prevent fusarium dry rot in the tubers.

Vine kill Average days from planting to vine kill is 100. Vine killing is required. Good skin set occurs within 21 to 30 days. If petiole nitrogen falls below 5,000 ppm before vine killing good tuber skin set should result which is very important.

STORAGE MANAGEMENT

Canela Russet stores well with few problems if cured well before harvestand sprouting is negligible. Canela Russet has a very long dormancy period of 147 days and usually need no sprout control.

DISEASE REACTION

Overall disease problems are minimal. Bacterial ring rot foliar symptom expression occurs within 90 days after planting.

Field Storage
Foliar early blight: Moderate Tuber early blight Resistant
Verticillium wilt: Moderate Bacterial soft rot Moderately Susceptible
Blackleg Moderately Susceptible Fusarium dry rot Susceptible
Seedpiece decay Moderate Leak (Pythium) Moderately Resistant
Leafroll virus Moderately Resistant Pink rot (Phytophthora) Very Resistant
Leafroll Net necrosis Moderately Resistant Silver scurf Resistant
PVY, PVX Moderately Resistant Rhizoctonia scurf Moderately Resistant
Bacterial ring rot Moderate Corky Ringspot Susceptible
Common Scab Resistant Powdery scab resistant

Disease reaction ratings susceptible, moderately susceptible, moderate, moderately resistant andresistant,