Disorders in green asparagus during postharvest

Asparagus spears are harvested as they emerge through the soil from the underground crowns. Typically, spears are cut when they reach approximately 23 cm (9 in). Stalk diameter is not a good indicator of proper maturity and associated tenderness. Rapid hydrocooling soon after harvest is strongly recommended. Pyramid-shaped wooden or waxed corrugated boxes for hydrocooling combined with center-loading during shipment promote good cooling-air circulation. Main physiological and physical disorders in green asparagus are following- Asparagus will continue to develop after harvest which is why low temperature postharvest management is critical. Common disorders include upward bending of tips away from gravity and "feathering" (expansion and opening) of tips. Bending will also occur if tips expand to the top of the packaging and are deflected- Spear toughening occurs rapidly at temperatures above 10?C (50?F)- Bruising and tip-breakage are signs of rough handling and can result in toughening of the spears from wound ethylene- Asparagus is sensitive to chilling injury after 10 days at 0?C (32?F). Symptoms of chilling injury include loss of sheen or glossiness and graying of the tips. A limp, wilted appearance may be observed. Severe chilling injury may result in darkening near tips in spots or streaks- Freezing injury (water-soaked appearance leading to extreme softening) will likely result at temperatures of -0.6?C (30.9?F) or lower Pathological DisordersThe most prominent postharvest disease concern is bacterial soft rot, induced by Erwinia carotovora subsp. carotovora. Decay may initiate at the tips or the butt end. Spears that are re-cut above the white portion of the butt end are reported to be most susceptible to bacterial decay. SourceAsparagus (Green): Recommendations for Maintaining Postharvest Quality, Produce Facts, UC Davis Postharvest Technology The picture shows bacterial soft rot, by Marita Cantwell, more information More pictures about disorders Key wordsEsp?rrago?? ??? ?Asparagus?? ?aspersies?? ?????????? ????? ?asparagoj?? ?asperges?? ???????????? ??? ??? ?asparago?? ?szparagi?? ?espargos?? ????????? ?ku?konmaz?? ?asparagus ???? ?spargel?? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ? Poscosecha?? ?postcosecha?? ?postharvest?? ?na-oes?? ??? ??? ???????? ????? ??? ?post-r?colte?? ????? ?? ??????????? ??? ?na-oogst?? ?post-raccolta?? ?Obr?bka po?? ?p?s-colheita?? ????????????????? ?hasat sonras??? ??? ?Ernte?? ????????????????? ????? ????????????? ?postcollita?? ?poskliz?ov頠 ????? ??? ??? ??? ?nakon branja?? ?pozberov頠 ??? ?obdelovanje zemlje po?? ?post-colleita?? ?????? ??????? ?pascapanen?? ??il?onn postharvest?? ??????? ?p?c ra?as?? ?derliaus apdirbimas po?? ?lepas tuai?? ??? ?? ???????? ?post-recoltare?? ??????? ??????? ???????????????????? ?????????????? ?????????????????? ?sau thu ho?ch?? ?????????????????? ?zangemva kwenkathi yokuvuna?? ???? ?