Huanglongbing (Chinese for yellow dragon disease or yellow shoot disease, abbreviated as HLB) also known as citrus greening, is a lethal, fast-spreading bacterial disease of citrus. HLB is the worst disease of citrus trees worldwide.
Zinc nutrient deficiencies in pecan trees can cause several symptoms. Rosetting caused by shortened internodes, Interveinal chlorosis, and necrosis of young leaves are among them. This article gives some suggestions on how to mange your zinc applications.
Pecan bacterial leaf scorch (PBLS) is an important and chronic disease that affects pecan in Arizona, as well as other pecan production regions of the United States. This article discusses the disease.
Phymatotrichopsis root rot (abbreviated as PRR) is commonly referred to as Cotton root rot, Phymatotrichum root rot, Texas root rot, or Ozonium root rot. This pathogen is prevalent in all of major pecan production areas in Arizona.
Training and Pruning Newly Planted Deciduous Fruit Trees
Training and pruning newly-planted deciduous fruit trees is one of the most important steps in developing trees with a strong framework (scaffold branches). Trees with a good framework of branches can support heavy crops without limb breakage and will help to bring the young tree into production at an early age. Selection and arrangement of these branches determines the type of development and growth in later years. The goal of pruning and training is to balance vegetative and fruiting wood growth.
The most important disease of woody dicotyledonous plants in Arizona is Phymatotrichopsis root rot (Cotton or Texas root rot) caused by a unique and widely distributed soil-borne fungus, Phymatotrichopsis omnivora. This article talks about the diseases distribution, symptoms/signs, biology, identification, sampling, and control.
Leaf Sampling Guide with Interpretation for Arizona Pecan Orchards
Authors: Mary Olsen, Mike Matheron, Mike McClure and Zhongguo Xiong
Many diseases of citrus have been described world wide and have colorful and descriptive names such as: blue mold, green mold, gray mold, pink mold, pink nose, brown rot, black spot, black rot, black pit, yellow vein, yellow spot, rubbery wood, lumpy rind, curly leaf, corky bark, slow decline, spreading decline, and stubborn. This article secribes some of the diseases common to Arizona
Verticillium wilt may cause wilting of all or only parts of plants. Leaves become mottled or chlorotic and turn brown, often in interveinal parts of the leaves only. This article covers signs/symptoms, environmental conditions, the disease, and control.
Pruning is a common task necessary for best production of many common fruit trees. Most types of deciduous trees are pruned to invigorate the tree, to improve branch configuration, and thus make branches less likely to split under a heavy crop, to improve fruit quality, and/or to reduce the crop load which will improve the potential size of individual fruits.
Water is essential for citrus trees.This article discusses some of the symptoms of stresses caused by lack of water and gives suggestions on how to estimate and time water applications on citrus trees.
Authors: Thomas A. Doerge, Robert L. Roth, Bryant R. Gardner
Mature pistachio trees are moderately heavy users of nitrogen. The pronounced alternate bearing cycles observed in pistachios have the greatest influence on the optimum Nitrogen fertilizer rate to use.