Field Crops - Publications

Field Crop Publications

Sep 2019

Nondormant Alfalfa Varieties for Arizona 2019

Publication (PDF, 435KB)

Authors: Mike Ottman

Alfalfa varieties differ in fall dormancy, defined asgrowth during the fall. Nondormant alfalfa varieties are usually planted in mild winter areas for their ability to grow in the fall. Nondormant, very nondormant, and extremely nondormant alfalfa varieties (fall dormancy class 8, 9, and 10) are adapted to elevations below 4000 feet in Arizona.
Dec 2018

Promoting the Use of Predators

Publication (PDF, 5.7MB)

Authors: Peter C. Ellsworth, Naomi Pier, Alfred J. Fournier, Steven E. Naranjo, Timothy Vandervoet

New research has identified critical levels of predators that impact economic spray decisions for whiteflies. By working with the beneficials found naturally within a field, reliance on chemical controls could effectively be reduced.
Jul 2018

Interactions Between Insects & Weeds in Desert Crops - July 2018

Publication (PDF, 356KB)

Authors: John C. Palumbo

There is a positive correlation between weeds and insects. This article describes the relationship between weed management and insects. It details how weeds can be a refuge for beneficial insects and how they can also act as a reservoir for insect pests. The impact that weeds have on insecticide application is also discussed.
Feb 2017

Cotton Variety Testing Results - 2016

Publication (PDF, 4.36MB)

Authors: Randy Norton, Ayman Mostafa

Variety selection is one of the most important decisions a grower will make contributing to the success of a cotton crop. It is critical, that a grower have as much information as possible in order to make an informed decision regarding variety selection.
Nov 2015

Cowpea Aphid in Alfalfa

Publication (PDF, 248KB)

Authors: John Palumbo and Barry Tickes

Recent outbreaks of cowpea aphid in alfalfa are more than a local phenomena. Large populations of cowpea aphids have been reported throughout Arizona. The reason behind these outbreaks are unknown. This article hopes to bring some insight by discussing the cowpea aphid, the damage it causes, and suggestions on controlling it.
Oct 2015

Wheat and Barley Varieties for Arizona 2015

Publication (PDF, 657KB)

Authors: Dr. Michael J. Ottman

Contains a list of some of the different varieties of Wheat and Barley. There is also a chart detailing some of the yield information relating to each of the varieties.
Sep 2015

Nondormant Alfalfa Varieties for Arizona 2015

Publication (PDF, 437KB)

Authors: Mike Ottman

This article contains a chart of non dormant alfalfa varieties for Arizona. Suggestions for determining an appropriate fall dormancy class, identifying potential pest problems, yield, and salt tolerance are all discussed.
Jun 2015

Early Cotton Development

Publication (PDF, 281KB)

Authors: J. C. Silvertooth

After stand establishment, the next critical stage in the development of a cotton crop is the initiation of the first squares, or floral buds, which could develop into the plants’ first boll. This is an important step for a cotton crop and one which is usually followed closely by the attentive farmer.
Jun 2015

Water Management for Defoliation

Publication (PDF, 316KB)

Authors: Silvertooth, Jeffrey C.

There are several factors which are important to consider in managing defoliation. Factors such as plant-water relations, Nitrogen (N) fertility status, the extent of honeydew deposits on the leaves from insects such as the sweet potato whitefly or aphids, and weather conditions following the defoliant application are all important in terms of the final defoliation results.
Jun 2015

Soil Fertility and Soil Testing Guideline for Arizona Cotton

Publication (PDF, 293KB)

Authors: J. C. Silvertooth

According to all available evidence, there are 20 total nutrients necessary for complete plant growth and development. Not all are required for all plants, but all have been found to be essential to some.

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