ATLANTIC GUIDE
Description
Tuber Shape Oval to Round
Eyes Shallow evenly distributed eyes
Skin Smooth tan skin with light net
Flesh White
Plant Medium large sized upright vine with many faint lavender flowers

Atlantic is a medium- to late-maturing potato released in 1976 by Webb et al. USDA -Beltsville, Maryland (APJ 55:141-145, 197"@ It is primarily a chipping potato noted for its lightchip color. It also is considered a good baker; has wide adaptability to a diverse range ofirrigated growing conditions.

Plant/roots Relatively fast emergence; vine is medium large and upright with many faint lavender flowers; indeterminate growth habit; has a shallow, concentrated root system.

Tubers are smooth white fleshed, oval to round with light to heavy tan skin usually with a slight net. Eyes are shallow and well distributed; consistently high specific gravity (1.090)

Yield potential 450 to 500 cwt. range.

GROWING SEASON MANAGEMENT

Pre-planting considerations Tubers have medium dormancy; single drop or cut seed isacceptable. Germination tends to be uniform, regardless of eye location on the tuber. Avoidwarming seed for more than one week (60 F) prior to cutting, to prevent excessive sprouting. When using cut seed, pay special attention to proper sanitation and provide optimum healingconditions since threat of seed-piece decay caused by Erwinia carotovora and/or Fusarium spp.can be significant. Plant this cultivar 2 to 4 inches deep in a flat hill or up to 6 inches deep in apeaked hill.

Fertility (soil test basis; lbs/acre)

Apply total fertilizer in the following range: N(l70-1 80#), P(l20-190#), K(O-60#). Performance in alkali soils is good. Pre-plant incorporated N should be 80 to 90#. Early seasonN applications do not adversely affect the timing of tuberization. Sprinkler applied N should bein 90 to 100# range at a rate of 20# per application, no later than mid-August.

Irrigation

Irrigation interval at the maximum ET is 2 to 2.5 days. Drought tolerance is moderate.

Pest control

Weeds Competition against weeds is good. This cultivar is sensitive to post emergenceapplications of metribuzin.

Insect Control Standard insect control measures generally are effective.

Fungicides Two to three fungicide applications may be necessary to control foliar early blight.

Tuberization/bulking Tubers set in the middle of the hill; rapid tuber bulking occurs early in theseason. Tubers are susceptible to hollow heart, blackspot, shatter bruise but moderately resistantto growth cracks and resistant to second growth. Under severe, hot conditions, especially insandy soils, tubers may have internal brown spot ie, heat necrosis.

Vine kill Average days from planting to vine kill are 1 00 to 1.10. Vine killing is required duringmost years; relatively easy to achieve after maturity is reached. Adequate skin set occurs within14 to 21 days. Tubers can become very large late in the season, thus monitoring is necessaryafter mid-August.

STORAGE MANAGEMENT

Atlantic stores well if tubers are carefully harvested and not bruised. Susceptibility to bruising requires extra attention during harvest and handling into storage. Fusarium seed piece decay canbe a problem during long-term storage. Atlantic tends to sprout early, use minimumtemperatures. Approach long-term storage for chips with extreme caution! When using CIPC tocontrol sprouting, delay application until wound healing is complete.

DISEASE REACTION

Overall disease problems are minimal. Bacterial ring rot foliar symptom expression occurswithin 90 days after planting. PVY expression may be mild.
Field Storage
Foliar early blight: Susceptible Tuber early blight Moderate
Verticillium wilt: Moderate Bacterial soft rot Susceptible
Blackleg Susceptible Fusarium dry rot Susceptible
Seedpiece decay Susceptible Leak (Pythium) Susceptible
Leafroll virus Susceptible Pink rot (Phytophthora) Susceptible
Leafroll Net necrosis Immune Silver scurf Unknown
PVY, Susceptible Rhizoctonia scurf Moderate
Bacterial ring rot Susceptible
PVX: Immune

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.