Some Videos to Check Out
Lettuce Insect Losses and Insecticide Usage
Since 2004, the UA Vegetable IPM Team has annually surveyed PCAs and growers to
document insect pest activity and pesticide usage in Arizona lettuce through interactive
workshops. We will be holding the 2014 Lettuce Insect, Disease and Weed Losses Workshop
next Thursday, April 24 at the Yuma Agricultural Center beginning at noon (a yummy
lunch is provided at no cost). The information provided by PCAs and growers during
these workshops can be very useful to the lettuce industry. First, the data can
be extremely helpful in addressing state and federal regulatory issues by providing
“real world" information on insect pest status and insecticides usage. In the past
data generated from the surveys has been used to support registrations of key insecticide
products (i.e., Lannate). Secondly, from an academic perspective, the results of
these surveys provide us with a historic record of insect occurrences which allows
us to prioritize some of our research and educational activities. Over the years,
insecticide usage data has provided valuable support for grant proposals. Finally,
and perhaps most importantly for PCAs, it can translate their efforts into economic
terms for their growers and confirms their value to the lettuce industry by showing
the importance of key insect pests and their cost-effective management in desert
lettuce production. For example, survey results from the
Lettuce Insect Losses and Insecticide Use Summary: 2004-2013
on average, 1) costs associated with pest management fees have increased steadily
where the cost of scouting and making management decisions by PCAs are well over
$20/acre, 2) Leps, aphids and thrips are the most important economic pests in fall
and spring lettuce, and 3) the use of older, broadly toxic insecticides (OP/Carbamates/Endosulfan)
has dropped significantly, whereas use of the newer, softer reduced-risk chemistries
(e.g., Radiant, imidacloprid, and diamides) continues to increase. Of course, PCAs
already know this, but these surveys document this information for those less involved
with the day-to-day activities of IPM in desert lettuce. Hopefully PCAs and growers
see the value in this process and will join us next week at
2014 Lettuce Insect, Disease and Weed Losses Workshop
. See you there!
Click picture to listen to John’s update
To contact John Palumbo go to: firstname.lastname@example.org
Spring is a time of transition for agriculture in the desert southwest. Cool season
crop harvest is wrapping up and spring and summer crops are being planted and grown.
This is also powdery mildew season. Powdery mildew can develop on commercial crops,
such as late-season lettuce, wheat or melons, as well as landscape plants. It is
not too early to begin considering management options for powdery mildew on melons.
The disease generally is favored by dry weather conditions, moderate temperatures,
reduced light intensity, fertile soil, and succulent plant growth. The overall risk
of powdery mildew increases as more of these factors become established in a melon
field. Dry weather conditions and fertile soil are givens in our desert melon production
fields. Spores of the melon powdery mildew pathogen, Podosphaera xanthii
, can germinate
to initiate disease at temperatures ranging from 72 to 88°F, and optimally at about
82°F. These moderate temperatures as well as reduced light intensity and succulent
plant growth all become increasingly prevalent as the melon plantings grow rapidly
during April and May. Another factor to consider when determining powdery mildew
risk is the inherent susceptibility of the melon cultivar being grown. Those varieties
known to be susceptible to powdery mildew will require implementation of a rigorous
disease management program involving applications of fungicides with differing modes
of action throughout the period of high disease risk. On the other hand, melon varieties
that have moderate to high levels of genetic resistance to the pathogen will require
less fungicide inputs. To achieve maximum levels of disease control, powdery mildew
fungicide application programs must be initiated before the visible detection of
the fungus. Good levels of disease control can also be attained by waiting to begin
fungicide applications until no later than the very first sign of disease in the
field. These initial infection sites are often on the underside of leaves, so frequent
and comprehensive examination of the melon planting is required.
Click picture to listen to Mike's update
The University Of Arizona Herbarium
Most people are unaware that the largest herbarium in the southwest is located in
the center of the university of Arizona campus. The University of Arizona Herbarium
is located in the second oldest building on campus. It was established in 1850,
the year before the University of Arizona opened its doors. Originally located in
old Main, it contained 700 native plant specimens from southern and central Arizona.
It now contains over 420,000 plant specimens and over 40,000 mycological specimens.
The Herbarium is a plant museum where specimens are dried, preserved and cataloged.
It is used by scientists, students, public agencies and homeowners. It is used for
many purposes, which include documenting rare and endangered species, evolution
and morphology of species that have occurred in the region over the last 150 years.
The specimens are sometimes used as a source of DNA for molecular analysis.
Herring Hall, where the herbarium is located, was originally built in 1903 as the
man’s gymnasium. It was built with a $5000 gift from the Copper Queen mining company.
This gift was arranged by William Herring who was the legal consul for the company.
Specimens can be submitted to the Herbarium and it is also open daily to the public.
Please contact them first if you plan to submit samples. email@example.com
Click picture to listen to Barry
The Vegetable IPM Updates Archive page provides links
to updates from previous weeks.
The Vegetable IPM Video Archive page contains a collection
of educational videos from current research work in vegetable crops by University
of Arizona Researchers.
For questions or comments on any of the topics please contact Marco Pena at the Yuma Agricultural Center.
College of Agriculture, The University of Arizona, Tucson, AZ.
document located at: http://cals.arizona.edu/crops/vegatables/advisories/advisories.html
Copyright © 2001 University
College of Agriculture and Life
Webmaster: Al Fournier (firstname.lastname@example.org)