TABLE CONTENTS

This nematode has been probably entered to the country through imported seedlings, tubers
or bulbs of ornamentals. Efforts to stop further spread of this nematode- because of its vast
host range and damage capability, must be taken.
Efficacy of Fumigant and Non-fumigant Nematicides for the Management
of Meloidogyne chitwoodi in Idaho Potatoes
Hafez, S.L & P. Sundararaj
University of Idaho, Parma Research and Extension Center, 29603 U of I Lane, Parma, ID, 83660, USA
Two field experiments were conducted at the University of Idaho, Idaho, USA to study the
efficacy of different combinations of Vapam HL, Temik 15G, Mocap 6EC, Vydate C-LV and
different application methods of fosthiazate for the control of Meloidogyne chitwoodi in
potato. The experiments were laid out in a randomized complete block design with seven and
six treatments in a field each with five replications for the first and second experiment
respectively. Mocap treatments were surface broadcast using a tractor-mounted plot sprayer
and Vapam was applied as broadcast by fumigation bar. Temik and Admire were applied in
furrow at planting. Vydate was applied at planting and chemigated subsequently after
planting. Preplant treatments (PPI) of fosthiazate were broadcast sprayed or shanked at 6 inch
deep or shanked followed by rototilling or broadcast surface spray with the nozzles attached
to the front of the rototiller. Potato cv. Russet Burbank seed pieces were planted on 25 th April
in rows three feet apart. Weeding and other normal cultural practices were followed. Five
months after planting, the tubers were hand-harvested on 2 nd October from 15 feet of the
middle two rows of each plot and weighed. The tubers were graded and evaluated for
nematode infection. Data from both experiments indicated that there was an increase in total
yield in different combinations of treatments compared to control plot. Percent of nematode
infected tubers in treated plots ranged from 6 to 27.4 and 5.6 to 35.5 for the first and second
experiment respectively. Lowest level of nematode infection was observed in the Mocap
2gal + Temik 20 lb + Vydate 2.2 pt (6.0 %) applied plots and; Fosthiazate 4.5 ai/A + Temik
20lbs at planting (5.6 %) applied plots in the first and second experiment respectively.
5 th International Congress of Nematology, 2008 251