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Hybrid seed production :
            Growth regulators can be used as an aid in hybrid seed production. Use of ethephon has been used for producting temporary female lines in some cucurbits.
                   Successful F1 hybrid in butter- nut squash has been made by using female line produced with ten weekly sprays of ethephon plant growth regulators have also been used for maintenance of gynoecious lines.
·       Silver nitrate at 500 mg/l has been reported to be  as effective as GA3 in inducing male flowers on gynoecious lines of cucumber.
·       However, in muskmelon foliar sprays of silver thiosulphate at 400 mg/l was found best for induction of male flower on gynoecious lines.
Fruit Set :
·       Poor fruit set is a major problem in tomato, brinjal and chillies which is frequently caused by adverse weather conditions during flowering.
·       Plant growth regulators have been reported to enhance fruit set under both normal and adverese weather conditions.
Parthenocarpy :
·       Studies on use of growth regulators in many vegetables have shown an increase in the fruit size with their applications.
·       The role of plant growth regulators in fruit development can also be seen from the fact that withtheir help it is possible to stimulate fruit development without fertilization (parthenocarpic).
·       In brinjal, application of 2,4-d at 0.00025% in lanolin paste to cut end of styles or as foliar sprays to freshly opened flower cluster has been reported to induced parthenocarpy.
Fruit Ripening :
·       Ethephon, an ethylene releasing compound, has been reported to induce ripening in tomato and paper.
·       Field application of ethephon at 1000 mg/l at turning stage of earliest fruits induced early ripening of fruits thus increasing the early fruit yield by 30-35%.

·       Pst-harvest dip treatment with ethephon at 500-200 mg/l has also been reported to induce ripening in mature green tomatoes. 

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