S. Chandraparnik, H. Hiranpradit, S. Salakpetch, U. Punnachit
Upon detection of flower buds in durian, they might not be followed by normal development unless the variable factors are most prevailed. A small amount of rainfall occurred at dot stage of flower bud development resulted in cessation of development. Escapers of such event may face the situation of uncommercial threshold and scale down the number of developed flower buds, which leads to difficult subsequent management of the crop. Influence of thiourea on flower bud in counteract with the effect of the rain was then conducted.

Thiourea at three : 500, 1,000, and 1,500 ppm were sprayed on branches of durian trees pretreated with 1,000 ppm paclobutrazol. The application was made when the first stage of flower bud development was detected. Thiourea can intensify the number of inflorescences per unit length of branch, resulting in higher number of flowers per tree. A positive correlation (r = 0.661**) between the effect of thiourea concentration and flower density was very promising. An increase of 75% in the total number of flower per tree was observed in trees treated with 1,500 ppm thiourea when compared with the trees that were treated with paclobutrazol alone. However, thiourea failed to intensify the number of flowers per tree when the amount of rainfall exceeded 35 mm per day.

Chandraparnik, S., Hiranpradit, H., Salakpetch, S. and Punnachit, U. (1992). INFLUENCE OF THIOUREA ON FLOWER BUD BURST IN DURIAN, DURIO ZIBETHINUS MURR.. Acta Hortic. 321, 348-355
DOI: 10.17660/ActaHortic.1992.321.37

Acta Horticulturae