Avocado ( Persea Americana ) tree diagram originated in southerly Mexico , but are now grown in tropic and subtropical areas around the world . Some varieties of avocado tree have upright forms and develop up to 60 feet marvellous . Others have propagate form and are only 30 feet tall . They are evergreen or semi - evergreen .
West Indian avocado trees grow in South Florida and the fruit has thin or medium - thick shining skin . Guatemalan avocados have deep , warty , brickly peel . The trees produce in Coastal California . The hardiest avocado trees are the Mexican varieties . They grow in California and the fruit has smooth , thin skin .
Persea Americana trees need well - drained territory and do not tolerate soggy condition . They can not withstand stale weather condition and temperatures in the mid-20s Fahrenheit can damage even the Mexican variety .
Anthracnose
Anthracnose is a fungal disease that is most common on mature avocado fruit , although it will also infect vernal fruit , leaves and twigs . brownish or black , slightly sunken roofy form on infected yield , which thrive rapidly and make the flesh of the fruit to decay . The disease can be treated with veritable applications of a antifungal approved for anthracnose on avocado tree diagram .
Phytophthora Root Rot
stem hogwash have by Phytophthora fungus kingdom is usually not treatable and finally the infected avocado tree dies . The kingdom Fungi cause the feeder roots to become black-market and brittle . As the roots die , the foliage wilts or turns pale and drops off , and sprig and fore start to die . Plant avocado Sir Herbert Beerbohm Tree in well - drain soil to help prevent transmission .
Powdery Mildew
Avocado tree are oft affected by powdery mildew , which can become grievous if result untreated . morose green or purple - brown pip come out on the gloomy side of septic leaves , follow by white-hot or gray powdery increase . Yellowish - green spots appear on the upper side of the foliage . Use a antifungal approved for powdery mould on avocado trees to foreclose and control the disease .
Pseudocercospora Spot
A unwashed disease on avocado Sir Herbert Beerbohm Tree in tender humid weather is pseudocercospora spot . little brown or purplish - brown lesions appear on infected leaves , stems and fruits . A felt - like mass may grow in some of the lesions . Pseudocercospora spot can be treat with a pig or azoxystrobin spray for alligator pear trees .
Scab
The fungus , Sphaceloma perseae , causes scab disease on leaves and sprig on the upper portion of avocado tree Tree , as well as the yield . The yield develops ellipse dark-brown or purplish - browned floater that are slightly raised . As the spot merge , the centers sink . Use a copper or azoxystrobin spray for avocado trees to treat strikebreaker .
Caution
Use a antimycotic , bull or azoxystrobin spray that has been approved to treat specific diseases on avocado trees and follow the manufacturer ’s steering .
dispatch and destruct morbid plant textile and debris around trees to keep the spread of disease .
