Volume 49 Number 1 Article 3
Year 1995 Month 1
Title: Fruit Firmness, Calyx and Neck Ratings Correlated with Field Fruit Rot Reactions of Nine Strawberry Cultivars
Authors: B. Olcott-Reid and J.N. Moore
Abstract:
Fruit calyxes and necks were rated, and fruit
epidermis toughness and flesh firmness were
measured, for nine strawberry (Fragaria x
ananassa) cultivars on four harvest dates during
1991. These data were correlated with percent
of fruit with each of several rot diseases at
harvest in 1991 and 1992. The cultivars differed
significantly for all traits. *Earliglow' and 'Tristar'
had the most reflexed calyxes, and 'Earliglow'
and 'Cardinal' had the most raised necks.
'Cardinal' and 'Allstar' had the greatest fruit
flesh firmness and epidermis toughness.
Greater
fruit epidermis toughness did not correlate well
with reduced levels of any fruit rot.
Greater
fruit flesh firmness correlated significantly, although not highly (r = 0.26 to 0.37), with reduced
anthracnose fruit rot (caused by Colletotrichum
gloeosporioides (Penz.) Penz. & Sacc), leather
rot (incited by Phytophthora cactorum (Leb. &
Cohn) Schrot.), and total rots during both years,
but not with reduced gray mold (caused by
Botrytis cinerea Pers.:Fr.). Mid-season calyx ratings correlated significantly (r = 0.39 to 0.50)
with reduced leather rot, anthracnose and total
rots during one year each.
Both mid-season
neck ratings, and the mean of mid-season calyx
and neck ratings, correlated significantly (r =
0.37 to 0.62) with reduced levels of all rots
during both years, except for leather rot in 1992.
Overall, the mid-season calyx-neck mean predicted rot levels the best of the fruit traits
studied.
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