EFFECT OF SPRAYING SOME CHEMICAL SUBSTANCES AND A FUNGICIDE ON FLORAL MALFORMATION DISEASE IN MANGO

Two field trials with 20 years’ old mango trees, cvs.
Taimour and Mabrouka (high susceptible cultivars), were conducted at Fayoum Governorate, Egypt.
In these trials, the trees were sprayed with NAA at 200 ppm, IBA at 500 ppm, phosphoric acid at 500 ppm, GA₃ at 50 ppm, zinc sulphate at 5% and Cuprous oxide (Cu₂O)at 0.4%. After removing all affected floral panicles with three additional nodes behind these floral malformation, at full bloom, the above mentioned treatments were applied in order to control floral malformation.
The obtained results showed that the incidence of floral malformation disease was best reduced in the next flower season by using any of the used treatments compared with the untreated trees.
Also, the produced fruit yield from treated trees was significantly higher during the first and the second seasons in comparison with that of the untreated trees.
NAA gave the best results followed by IBA, phosphoric acid, zinc sulphate, GA₃ and Cuprous, respectively.

VII International Mango Symposium

H.A.H. Mahrous

Mabrouka, Taimour, NAA, IBA, phosphoric acid, zinc sulphate, GA₃

https://doi.org/10.17660/ActaHortic.2004.645.63