Citrus Research & Technology
Citrus Research & Technology
Short Communication

Effects of paclobutrazol on growth and flowering of citrus

Dalmo Lopes De Siqueira & Luiz Carlos Chamhum Salomão

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Paclobutrazol (PBZ), a substance of the triazole group, reduces gibberellin synthesis via inhibition of kaurene oxidase. In citrus, PBZ is studied due to its growth retardant and flowering effects, which shows a potential to promote off-season fruit harvest. Paclobutrazol is applied to soil or sprayed over the leaves. Some results indicate that the first method is more efficient compared to sprayed due to the low foliar absorption. Favorable effects were obtained on flowering promotion of ‘West Indian’ acid lime, kumquats, ‘Satsuma’ mandarin, Tahiti lime, ‘Eureka’ lemon, ‘Valencia’ and ‘Shamouti’ sweet oranges. Decrease of vegetative growth was also observed in ‘Mineola’ tangelo and in ‘Carrizo’ citrange seedlings. Undesirable effects, as fruit dropping in ‘Valencia’, flower deformation in ‘Ponkan’ mandarin and production of small fruits in ‘Rio Red’ grapefruit can also occur. The large use of PBZ on commercial citrus groves is still premature, because of product effectiveness depends on plant inductive stage, nutritional and sanitary conditions, variety or species, dosage, time and product delivery methods.


Citrus, paclobutrazol, growth retardants, flowering.
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