Responses of Nematode Infected Peanut Plants to Maleic Hydrazide1
- Donald J. Banks2
Gall formations on the roots of plants that are susceptible to root-knot nematodes may be due to the presence of an auxin. Maleic hydrazide (MH), an antiauxin, has produced nematode and gall-inhibiting effects in some plants. This chemical was tested on peanuts, Arachis hypogaea L., to determine if it would aid in preventing galling and nematode damage.
A seed soaking treatment at planting in 125 ppm and also foliar spray applications of 125 and 250 ppm of maleic hydrazide were applied to ‘Dixie Spanish’ variety peanuts that were in the two-leaf stage. The plants were grown in the greenhouse at 21 to 29C for 42 days in soil that had been inoculated at planting with Northern root-knot nematode, Meloidogyne hapla Chitwood.
Little stunting and slight chlorosis occurred in the seed treatment but severe stunting and chlorosis was observed early in the test in the foliar applications. At harvest, total plant green weights and plant heights were significantly reduced in the MH foliar treatments. Galling was not inhibited and microscopic examinations of the galls failed to reveal significant differences in giant cell formation, or nematode development or reproduction in the MH treatments.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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