CHIPETA

Characteristics Shape: Round Skin: White Flesh: White Market Use: Chipping and Processing Markets Medium to Late Maturing

Chipeta is a medium- to late-maturing chipping potato released in 1 993 by Colorado StateUniversity (contact the San Luis Valley Research Center for additional information). It is notedfor its excellent chip color during long-term storage. It is also considered a good baker and haswide adaptability among irrigated growing conditions.

Plant/roots Plant emerges quickly; large and erect with many reddish-purple flowers;indeterminate growth habit; deep, spreading root system that helps provide adequate water andnutrient uptake for the large vines.

Tubers are white fleshed, oval to round with white to light tan skin; eyes are shallow and welldistributed; tubers consistently have high specific gravity 1.094.

Yield potential 450 to 500 cwt. range

GROWING SEASON MANAGEMENT

Pre-planting generations Tubers have a medium-long dormancy; both single drop or cutseed is acceptable. Germination tends to be uniform, regardless of eye location on the tuber. Avoid warming seed for more than one week at 60 F prior to cutting, to prevent excessivesprouting. Plant this cultivar 2 to 4 inches deep.

Fertility (soil test basis; lbs/acre)

Apply total fertilizer in the following range: N(l20-140#), P(l00-200#), K(O-60#). Performancein alkali soils is excellent. Pre-plant, Incorporated N should be from 60 to 70#. Early season Napplications may adversely affect the timing of tuberization. Sprinkler applied N should be in60 to 80# range at a rate of 20# per application, no later than mid-August. During periods ofrapid growth, this cultivar may express a mosaic pattern in the leaves not caused by virusinfection.

Irrigation

Irrigation interval at the maximum ET is three days. Drought tolerance is excellent.

Pest control

Weeds Competition against weeds is excellent with no major herbicide sensitivities known. Insects Standard insect control measures generally are effective.

Fungicides Control of foliar early blight usually is accomplished with one fungicide application,but, sometimes no fungicides are required.

Tuber/bulking Tubers set in the middle of hill but later growth occurs throughout the hill. Rapidbulking occurs mid to late season. Tubers are resistant to hollow heart and second growth,butonly moderately resistant to blackspot and shatter bruise.

Vine kill Average days from planting to vine kill are 1 1 5 to 1 20. Vine killing is requiredduring most years and can be achieved relatively easily if mature. Excessive N can delaymaturity and make vine kill difficult. Adequate skin set occurs within 1 4 to 21 days. Monitoring of tuber size is necessary after mid-August to avoid excessive oversize.

STORAGE MANAGEMENT

Chipeta is considered an above-average storage chipper. It maintains good chipping quality andgenerally has few sprouting problems. If it is stored for chips (vs seed), a temperature of near 50F is required,

DISEASE REACTION

Overall disease problems are minimal. Bacterial ring rot foliar symptom expression usuallyoccurs about 65 to 70 days after planting. Excessive early N applications may delay typicalleafroll symptoms.

Field

Foliar early blight Moderately Resistant

Verticillium wilt Moderately Resistant

Blackleg Susceptible

Seedpiece decay Susceptible

Leafroll virus Susceptible

Leafroll Net necrosis Resistant

PVY Susceptible

PVX Susceptible

Common Scab Susceptible

Bacterial ring rot Susceptible

Storage

Tuber early blight Moderately Resistant

Bacterial soft rot Susceptible

Fusarium dry rot Susceptible

Leak (Pythium) Susceptible

Pink rot (Phytophthora) Susceptible

Silver scurf Unknown

Rhizoctonia scurf Moderate

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