The present investigation was carried out in three successive seasons of 2019, 2020 and 2021 to examine the effect of spraying Pota crastal or Vast trivolium compounds each at 0.1% either once, twice or thrice on berry setting, yield and berries quality of Superior grapevines grown under El- Minia region.
Spraying of Pota crastal or Vast trivolium compounds once, twice or thrice each at 0.1% was very effective in stimulating berry setting %, yield and both physical and chemical of berries compared to untreated. Using vast trivolium compound was favourable in enhancing berry setting %, yield and quality parameters rather than application of Pota crastal compound.
The promotion on berry setting %, yield and quality of the berries was associated with an increase in the number of spraying times from one to three times.
The best results with regard to berry setting % , yield and berries quality of superior grapevines grown under El- Minia region were observed due to treating the vines three times during each season at growth start, just after berry setting and at one month intervals with {ast trivolium compound at 0.1%.