Response of Marah oreganus to herbicides Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/d217qs07x

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  • Marah oreganus, a perennial, belongs to the Cucurbitaceae family and it is commonly known as wild cucumber. In the past, this plant grew along fence rows, but now wild cucumber has become a weed problem in perennial grass seed fields of western Oregon. Several research studies were conducted to examine the biology of the weed and to observe the response to herbicide applications. Two experiments were conducted to determine if the dormancy of wild cucumber seed was due primarily to the effect of the seed coat and/or a chilling requirement. Results of this study indicated that dormancy can be broken by chilling and was not the result of seed coat impermeability. There is a minimum time that wild cucumber seeds must be exposed to cold temperatures before dormancy is broken. In this research, 22 days at constant 5 C was insufficient to break dormancy. Complete germination was obtained when seeds were kept at constant 5 C, and were covered with moistened, but not saturated, peat moss for 58 days. Other experiments in the greenhouse were conducted to examine the response of seedling wild cucumber to herbicides and to develop a technique for growing seedling wild cucumber under controlled conditions. Preliminary trials using garden cucumber (Cucumis sativus) as an indicator plant were used to determine herbicide rates for subsequent experiments. This study indicated that picloram and phenoxy herbicides did not cause necrosis on seedling wild cucumber but were most effective as growth inhibitors. Treatment with 2,4,5-T at 0.14 kg/ha caused more severe reduction in dry weight than with 2,4-D at 4.48 kg/ha. Glyphosate at 0.28 kg/ha was the only herbicide tested that caused necrosis to the leaves and inhibited growth of wild cucumber. DPX-4189, fosamine, and Dowco 290 did not induce any visual symptoms, although reductions in growth from the check 12 days after treatment were observed. Two field trials were conducted to evaluate the control of established wild cucumber plants. Evaluations were made over a 2-year period in the same plots. During the treatment year (1980), only two herbicides controlled wild cucumber at a level that would be commercially acceptable. The herbicides most effective for this purpose were glyphosate (2.24 or 3.36 kg/ha) and 2,4,5-T (0.84, 1.68, or 3.36 kg/ha). At one location, wild cucumber plants treated in 1980 with glyphosate and 2,4,5-T did not show regrowth in spring or summer, 1981. The other location was accidentally destroyed and no valid regrowth data were collected.
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  • description.provenance : Made available in DSpace on 2013-08-27T16:35:29Z (GMT). No. of bitstreams: 1 FloresMaurilio1982.pdf: 449144 bytes, checksum: d72589747f4455a863d4fbbbdd97d40b (MD5) Previous issue date: 1981-07-29
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