25 Jun 2024
Citrus Fruit Drop

PGR For Controlling Pre-Harvest Fruit Drop And Improving Quality of Kinnow

A field trial was conducted to evaluate the effect of PGR (2, 4-D, NAA and GA3) at different concentrations on fruit drop and enhancement in fruit quality of Kinnow. Three sprays of PGR viz. 2, 4-D, NAA and GA3 were given to the Kinnow plants as per the treatment concentrations from initiation of flowering to before harvesting. The results revealed that among all the PGR’s tried at different concentrations, spray of 2, 4-D @ 30 ppm was the most promising in reducing the fruit drop in Kinnow as fruit physical and chemical characters were found to be superior as compared to all other treatments. There was an enhancement in the fruit size with the application of 2, 4-D @ 30 ppm, which led to an overall increase in the yield of Kinnow.

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20 Mar 2024
The effect of avocado sunblotch disease

The effect of avocado sunblotch disease (ASBD) on tree morphology, fruit maturity, yield and quality of ‘Hass’ avocado in South Africa

Avocado sunblotch viroid (ASBVd) is found in many avocado-growing regions of the world, where it affects fruit yield and quality. The trees develop two types of infections: symptomatic and symptomless infections. Symptoms are most obvious as yellow streaks on leaves, fruit and green stems of symptomatic trees and symptomless carrier trees do not display any such symptoms. Symptomless carrier trees are considered the primary source of disease transmission in orchards. Hence, this study investigated the impact of ASBVd-infected symptomless carrier trees on tree morphology, fruit maturity, yield and quality of ‘Hass’ avocado from 2019 until 2021. Differences were observed in the orchard between infected and healthy trees; trees with medium and high viroid concentrations excessively produced flowers, lost leaves during flowering and ultimately bore few to no fruit at the end of the season.

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25 Nov 2022
Fruit size in Star Ruby Grapefruit.

The usage of auxins with various cultural techniques to increase fruit size in Star Ruby Grapefruit

Fruit size is a key parameter for quality and increases the profitability for export markets in citrus production in Turkey. Fruit size can be enhanced by several techniques such as girdling and thinning. Various plant growth regulators are known to affect the growth and size of citrus fruit. Thus the effects of synthetic auxin applications (2,4-DP and 3,5,6-TPA) at different physiological periods, girdling practices, pruning practices, foliar application of potassium and various combinations of these practices on the fruit size and yield, fruit retention rate, and leaf chlorophyll concentration and fluorescence of Star Ruby grapefruit cultivar were investigated.

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