SANGRE

Sangre is an early, medium-maturing, fresh market red potato released in 1982 by Colorado State University (APJ 59:435-437,1982). It is considered excellent for baking and boiling and ranks high in taste tests. It has a relatively high level of Vitamin C (20.Omg/lOOgm fresh weight basis).

Plant/roots This cultivar is slow emerging with a medium vine and lavender flower. Sangre has a determinate growth habit and a moderate to shallow, concentrated root system.

Tubers are white fleshed, oval and smooth with a deep red skin color; eyes are shallow and well distributed; low specific gravity (1.077).

Yields potential 400 to 450 cwt. range; t!-@lree selections; Sangre 10, Sangre 11 and Sangre 14, have a slightly later maturity and 50 to 1 00 cwt./acre higher yield potential.

GROWING SEASON MANAGEMENT

Pre-planting considerations Tubers have a medium to long dormancy; either single drop or cut seed is acceptable. When using cut seed, be aware of the potential for serious seed piece decay caused by Erwinia bacteria. Adequate warming of seed (at least seven to 1 0 days at 65 F) prior to planting is essential to obtain uniform emergence. Relatively close seed spacing may help optimize yield and tuber size. Plant seed 2 to 4 inches deep with a good hill cover. Since Sangre has a relatively fast growth rate, later planting dates may be selected without compromising yield potential. However, the time required for skin set can be a week longer than other cultivars.

Fertility (soil test basis; lbs/acre)

Apply total fertilizer in the following range: N(l 30-1 60#), P(l 20-200#), K(O-60#). Performance in alkaline soils is poor. Pre-plant incorporated N should be from 90 to 1 00#. Early season N applications do not adversely affect the timing of tuberization. During early season rapid growth, the upper whorl of leaves on the plant will often be yellow-green; this is not a disease problem. Sprinkler applied N should be in the 40 to 60# range at a rate of 20# per application.

Irrigation Irrigation interval at the maximum ET is 2.5 days. Drought tolerance is moderate. Water use drops dramatically during vine maturation, so careful monitoring is essential to prevent late season overwatering and potential tuber decay caused by Pythium and Phytophthora.

Pest control

Weeds Competition against weeds is good. Sangre is sensitive to metribuzin and post emerge applications of Dual.

Insects Standard insect control measures generally are effective.

Fungicides Control of foliar early blight usually requires two to four fungicide applications.

Tuber/bulking Tuber set is heavy, somewhat shallow and localized in the hill. Tuberization occurs early and tubers bulk at a rapid rate early in the season. Tubers are resistant to second growth and moderately resistant to hollow heart, growth cracks and blackspot.

Vine kill Average days from planting to vine kill are 1 05 to 1 1 0. Vine killing is required in most years; can be easily accomplished once mature. Adequate skin set occurs within 1 8 to 26 days. Oversized tubers can be a problem so carefully monitor the crop after the first week of August.

STORAGE MANAGEMENT

Sangre stores well with few problems and sprouting is minimal. Growers have observed that Sangre's red color tends to fade during long-term storage.

DISEASE REACTION

Overall disease problems are minimal. Bacterial ring rot foliar symptom expression is intense and occur 70 to 80 days after planting. Tuber symptoms often accompany foliage expression. Erwinia caused bacterial soft rot can be a problem in storage if foliage blackleg incidence is high.

Excessive applications of water late in the season can create serious problems with leak. This cultivar rarely has problems with viruses in the field because of low aphid preference.

Field

Foliar early blight Susceptible

Verticillium wilt Susceptible

Blackleg Susceptible

Seedpiece decay Susceptible

Leafroll virus Moderately Resistant

Leafroll Net necrosis Resistant

PVY Moderately Resistant

PVX Moderate

Common Scab Susceptible

Bacterial ring rot Susceptible

Storage

Tuber early blight Moderately Resistant

Bacterial soft rot Moderately Susceptible

Fusarium dry rot Moderately Susceptible

Leak (Pythium) Susceptible

Pink rot (Phytophthora) Susceptible

Silver scurf Susceptible

Rhizoctonia scurf Moderately Susceptible

Disease reaction ratings susceptible, moderately susceptible, moderate, moderately resistant and resistant.

Note: This information should only be used as a guide. Adjustments for local conditions must always be made.