Anatomical aspects of fruit drop in mandarin cv. Kinnow (C. nobilis Loureiro X C. deliciosa Tenore)
Loading...
Date
2020
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Punjab Agricultural University, Ludhiana
Abstract
The present study entitled “ Anatomical aspects of fruit drop in mandarin cv. Kinnow (C. nobilis Loureiro X C. deliciosa Tenore) was conducted
in the College Orchard and laboratories, Department of Fruit Science, Punjab Agricultural
University, Ludhiana during 2019-2020. It consisted of two experiments, viz., to study the
anatomical and biochemical dynamics occur during fruit drop and to evaluate new chemicals
for effective control of fruit drop in Kinnow mandarin. The length, girth and weight of fruit
stalk, total soluble proteins, total soluble sugars and minerals were recorded to be
significantly higher in non-abscised fruits as compared to the stalk of abscised fruits in May
and October during the year 2019. Lower activity of cell wall degrading enzymes was
recorded in non-abscised fruit stalks as compared to abscised fruit stalks. Absence of
abscission zone, thick xylem vessels and reduced pith were observed in the sections of nonabscised
fruit stalks; probably are the reasons for healthy fruit stalks in non-abscised fruits.
Foliar application with different combinations of fungicides and plant growth regulators were
given to the trees to reduce the fruit drop and increase the fruit yield. Fruit set per cent was
found to be non-significant among different treatments. According to periodic fruit drop data,
it was found to be maximum in the month of May followed by in June. The foliar application
of 10 ppm 2,4-D sodium salt and 0.1% Azoxystrobin (18.2%)+Difenoconazole (11.4%) was
found to be significantly superior to reduce the fruit drop and increase the fruit yield and to
improve other quality parameters (TSS, acidity, vitamin C, flavonoids, phenols and C/N
ratio). Maximum fruit weight (185.10 g/fruit), length (6.59 cm) and diameter (7.36) were
observed in the fruits picked from trees given the foliar spray of 10 ppm 2,4-D sodium salt
and 0.2% Carbendazin (12%)+Mancozeb(63%). Thus, it may be concluded that treatment
with 10 ppm 2,4-D sodium salt and 0.1% Azoxystrobin (18.2%)+Difenoconazole (11.4%)
was the most effective in controlling the fruit drop and enhance the fruit quality in Kinnow
mandarin.
Description
Keywords
Citation
Sidakmeet Singh (2020). Anatomical aspects of fruit drop in mandarin cv. Kinnow (C. nobilis Loureiro X C. deliciosa Tenore) (Unpublished M.Sc. thesis). Punjab Agricultural University, Ludhiana, Punjab, India.