New to Issan,our property has 14 mango trees, some quite old and some 3 years old and some new.All flowered massivly,compared with last year.Fruit on young trees mainly dropped off.Probably the oldest tree, is loaded.No rain here for 14 weeks but water every couple of days.Half the trees produced virtually no fruit, and flowering stems just turned black,and harboured some flying insects.Should these trees be pruned to promote new growth whan rain starts hopefullysoonNo idea about sprays or fertiliser. very hard to find information.Any advice appreciated