The present study was carried out during 2019 and 2020 seasons on Alphonse mango trees to evaluate the effect of some growth reg-ulators and systemic copper complexes on flo-ral malformation, yield and quality. Vegetative growth characters were superior with 200 NAA ppm and 100 ppm cofret. However, total chlorophyll, total carbohydrates and C/N ratio recorded the highest values with 200 ppm NAA. Macro elements N, P, K and Mg % were higher with GA3 at 100 ppm, whereas the highest values of micro elements Fe, Zn, Mn and Cu (ppm) were obtained with perfecto-one at 100 ppm. The number of total panicles/tree was increased with NAA 200 ppm and per-fecto-one 100 ppm treatments than other treat-ments. The number and percent of malformed panicles/tree were significantly decreased with the applied treatments than in control.. An in-creasing in total indoles, total phenols and pol-yphenol oxidase activity were recorded with 200 ppm NAA and 100 ppm perfecto-one treatments than in others. Final fruit set% and the number of fruits /tree were increased with the treatments of 200 ppm NAA and 100 ppm perfecto-one. However, the highest values of fruit weight were recorded by GA3 and perfecto-one both at100 ppm treatments, whereas the highest yield/tree values were rec-orded by NAA 200 ppm and 100 ppm perfecto-one. Finally, fruit quality involved TSS, acid-ity, L-ascorbic acid, total sugars and total ca-rotenoids were greatly improved with the ap-plied treatments than in control.

In field study, Eleven mango varieties, (Mangiferae indica L.) at Sharkia, Ismailia, and Fayoum Governorates, were examined to estimate the population fluctuation of the bud mite Eriophyes mangiferae Sayed, their susceptibility to mite infestation, the relation between the mite infestation and chemical contents of mango buds and the correlation between the bud mite and malformation disease. The highest population occurred during Sept. to Jan. or Feb. and the lowest population was existed during Mar. to Jun. Temperature and relative humidity had no significant effect on the mite population. The highest level of mite infestation was recorded at Sharkia followed by Fayoum and Ismailia Governorates. Mango varieties were differed in their susceptibility to E. mangiferae infestation. Zebda, Taimour, Ewais and Arnaba were the most susceptible varieties, while Mabrouka, Company, Excellent Succari and White Succari were the least susceptible ones. On the other hand Mesk, Geolck and Alphonse varieties showed moderate susceptibility to mite infestation. Buds of some high susceptible varieties possessed a lower values of total carbohydrates and total soluble sugars than some moderate or susceptible varieties to mite infestation. Phenol contents recorded a higher levels in the most of susceptible varieties while a lower levels were found in the most of moderate and low susceptible varieties. The total soluble proteins and amino acids recorded a higher values in some susceptible varieties. The susceptible characteristic was positively correlated with total soluble proteins and amino acids while negatively correlated with the total carbohydrates and total soluble sugars. However the phenol content showed no clear trend. Obtained results also revealed that mango varieties had varying degrees of floral malformation, Company, Alphonse and Geolck were the most susceptible varieties, while Zebda var. was the most resistant one. Statistical analysis showed a negative correlation between the eriophid bud mite and the incidence of malformation disease. Zebda var. harboured the highest number of mites but exhibited the lowest percentages of malformation, whereas the opposite trend was observed with company var