Experiments were conducted at Agriculture Research Station, Malepatan, Kaski district and
fanner's field at Panchakhal of Kavre district and Jiwanpur of Dltading district during the
consecutive years 2002 and 2003 to evaluate the effects of plant growth regulators (PGR) for
off-season flower regulation in3-5 year old guava trees. A randomized complete block design
with 3 replications was employed. Six treatments consisting of naphthalene acetic acid (NAA)
at 800 ppm: ethephon at 1800 ppm; potassium iodide (KI) at 1 percent; urea at 15 percent;
hand-picking of flowers, leaves and fruits; and control (non-treated) were used in the
experiment. The results revealed that the chemicals have significant effects on leaf shedding
and new flush emergence. Leaf shedding was completed in 24.67 days when NAA at 800 ppm
was used. ,Similarly new flushes started emerging in 19.67 days with the application of NAA.
This chemical (NAA) was also found more effective in postponing the flowering time (70 days)
which was 94.4 percent effective than with non-treated control guava plants. Ethephon at
1800 ppm was found very effective (83.33 percent) over that of non-treated guava. Potassium
Iodide ( Kl) was found less effective in postponing the flowering of guava (45 days). Etheplwn
was found nwst effective in shedding the fruits (only 2 fruit per plant not shedded). NAA was
found less effective to shade the fruits from the trees (48.33 fruits not shedded). New fruit
shedding was found to be highest ( 11.5 fruitslplam) in the trees where all the flowers, leaves
and fruits were removed in the beginning. Etheplwn was also found effective for new fruit
setting for off-seasoll. The results indicated that the most effective metlwd to regulate fruit
setting for off-season production was to remove all the leaves, flowers a/Ill fruits by hand
picking method. Application of Ethephon at 1800 ppm was found the most effective hormone
among the other chemicals for fruit setting in off-season.

Experiments were conducted at Agriculture Research Station, Malepatan, Kaski district and
fanner's field at Panchakhal of Kavre district and Jiwanpur of Dltading district during the
consecutive years 2002 and 2003 to evaluate the effects of plant growth regulators (PGR) for
off-season flower regulation in3-5 year old guava trees. A randomized complete block design
with 3 replications was employed. Six treatments consisting of naphthalene acetic acid (NAA)
at 800 ppm: ethephon at 1800 ppm; potassium iodide (KI) at 1 percent; urea at 15 percent;
hand-picking of flowers, leaves and fruits; and control (non-treated) were used in the
experiment. The results revealed that the chemicals have significant effects on leaf shedding
and new flush emergence. Leaf shedding was completed in 24.67 days when NAA at 800 ppm
was used. ,Similarly new flushes started emerging in 19.67 days with the application of NAA.
This chemical (NAA) was also found more effective in postponing the flowering time (70 days)
which was 94.4 percent effective than with non-treated control guava plants. Ethephon at
1800 ppm was found very effective (83.33 percent) over that of non-treated guava. Potassium
Iodide ( Kl) was found less effective in postponing the flowering of guava (45 days). Etheplwn
was found nwst effective in shedding the fruits (only 2 fruit per plant not shedded). NAA was
found less effective to shade the fruits from the trees (48.33 fruits not shedded). New fruit
shedding was found to be highest ( 11.5 fruitslplam) in the trees where all the flowers, leaves
and fruits were removed in the beginning. Etheplwn was also found effective for new fruit
setting for off-seasoll. The results indicated that the most effective metlwd to regulate fruit
setting for off-season production was to remove all the leaves, flowers a/Ill fruits by hand
picking method. Application of Ethephon at 1800 ppm was found the most effective hormone
among the other chemicals for fruit setting in off-season.