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Population Dynamics of Meloidogyne Incognita and Rotylenchulus Reniformis Alone and in Combination, and Their Effects on Sweet Potato T

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Population Dynamics of Meloidogyne Incognita and Rotylenchulus Reniformis Alone and in Combination, and Their Effects on Sweet Potato T Population Dynamics of Meloidogyne incognita and Rotylenchulus reniformis Alone and in Combination, and Their Effects on Sweet Potato t RONALD J. THOMAS and CHRISTOPHER A. CLARK ~ Abstract: Meloidogyne incognita (Mi) and Rotylenchulus reniJormis (Rr) interactions on sweet potato were studied in naturally and artificially infested field plots for 3 )'ears. In a naturally infested field, early season counts of Mi or Rr were positively correlated with later counts of the same nematode, but negative correlations were found between earl)" Mi and subsequent Rr, and earl), Rr and subsequent Mi counts, lu field plots fumigated with methyl bromide and then infested with low levels of Rr, Mi, and Rr + Mi, final population densities of Mi juveniles were reduced by Rr, but Rr was not affected by Mi. In held plots with a high natural population density of Rr, artificial infestation with high levels of Mi in both fumigated and nonfumigated treatments inhibited Rr, while the final Mi juvenile population density was not affected. Results indicate that a competitive interaction exists with each species capable of inhibiting the other and becoming the dominant population. The nematodes had no appar- ent effect on yield at the inoculum densities used, either alone or mixed. Both nematodes in- creased cracking of sweet potatoes, but mixed populations did not differ in incidence of cracking from either Rr or Mi alone. Key words: lpomoea batatas, root-knot nentatode, reniform nema- tode, interactions. Journal of Nematology 15(2):204-211. 1983. Meloidogyne incognita (Kofoid and been found. 'Goldrush' was reported to be White) Chitwood (Mi) and Rotylenchulus a poor host for reproduction of Rr (19), but reniformis Linford and Oliveira (Rr), two also is one of the most sensitive cultivars to of the dominant nematodes in tropical and damage by Rr (9). subtropical areas worldwide, commonly oc- Several workers have observed that Rr cur together in the same field and on the was the most abundant species in a field same host (1,14,22,27). Little information is while Meloidogyne spp. stayed at low pop- available, however, on their possible inter- nlation densities (5,7). Soil sampling in a actions on a particular host. If crop damage 10-year sweet potato rotation experiment is to be predicted based on nematode popu- (Martin and Birchfield, unpublished) in a lation counts, an understanding of nema- field infested with both Rr and Mi sug- tode behavior in polyspecific complexes is gested that Rr became the dominant species important. while Mi declined. Several greenhouse stud. Meloidogyne incognita, a serious patho- ies on possible interactions between Ra- gen of sweet potato (Ipomoea batatas and Meloidogyne spp. gave contradictory Poir.), has been observed to reduce root restdts. Sometimes Rr was inhibited by Mi, yields (17) and has been associated with while Mi was not affected by Rr (23). In severe root cracking (20). Resistant culti- other studies, Mi and M. javanica were in- vars have been developed (10,11,13). hibited and Rr was not ~ffected (16,25). In Rotylenchulus reni]orrnis has also been as- a histopathological study on cowpea (24), sociated with yield losses and poor quality root tissue reactions induced by Rr and of sweet potatoes (3). Recently, it was found M. javanica remained unique even when that cracking of fleshy roots in the field and feeding in close proximity. The objective the greenhouse was associated with Rr of this study was to determine if an inter- and could be limited by soil fumigation action exists between Rr and Mi and, if so, (9,12). So far no resistant cultivars have its effects oil yield and quality of sweet potatoes. Abstracts of this work have been Received for publication 3 May 1982. published (28,29). aPortion of Ph.D. dissertation by the senior author, Louisiana State University, Baton Rouge. 2Former Graduate Research Assistant and Associate MATERIALS AND METHODS Professor, respectively, Department of Plant Pathology and Crop Physiology, Louisiana State University Agricultural Experiment Station, Baton Rouge, LA 70803. Present Experiments were conducted on an address senior author: Department of Plant Pathology, Seed and Weed Sciences, Iowa State University, Ames, IA 50011. Olivier silt loam (5% sand, 80% silt, and We gratefully acknowledge the assistance of Dr. V. L. 15% clay) infested with Rr and Mi at Wright, Department of Experimental Statistics. Louisiana State University, Baton Rouge, LA 70803. Baton Rouge, Louisiana, in 1979, 1980, and 204 Population dynamics M. incognita and R. reniformis: Thomas, Clark 205 1981. Sweet potatoes were grown on ridges soil in pots was combined, and infested 30 cm high and 61 cm wide with 122-cm roots were cut in small pieces and mixed row spacing. Plots were 3.7 m long, planted with the soil. The egg and larval popula- with 10 terminal vine cuttings 30 cm apart, tion density in the soil and roots was esti- and separated by 122 cm alleys. mated, and uninfested tomato soil was used Soil samples were taken approximately to dilute the inoculum. For the 1980 test, every 30 days using a 2-cm-d soil probe inoculum of a Louisiana population of Rr with five probes per plot to a depth of 15- was increased by inoculating 'Centennial' 20 cm. Samples were extracted for 4 rain sweet potato plants in 15-cm-d pots with using a semiautomatic elutriator. Nema- Rr-infested soil from a greenhouse popula- todes were passed through 425-/~m sieves tion 5-6 months prior to planting. For the into a sample splitter, and 1/5 of the sam- 1981 test, flats of Rr-infested field soil were ple was collected on 38-#m sieves. The 38- collected on 18 February, brought to the /zm sieve fraction was then processed using greenhouse, and planted with Porto Rico centrifugal flotation (sucrose sp. gr. 1.18) sweet potato cuttings for nematode increase. (15). Counts were made of Mi juveniles and Prior to inoculation, infested soil from pots Rr juveniles + young adults per 250 cm :~ or flats was combined, and roots were cut soil. Root fragments collected on the 425- up and mixed with the soil. Field plots tLm sieves were extracted in 0.525% sodium were infested by distributing the Mi and/ hypochlorite for 10 rain for estimation of or Rr inoculum across wide furrows made nematode egg populations (6,8). Eggs of in the beds. The beds were then reformed the two species could not be distinguished and planted. The inoculum level for both in mixed population. years was estimated as 100 Mi or Rr per The 1979 field test was conducted in a 250 cm '~ soil in the upper 30 cm. Unin- field naturally infested with Rr and Mi. rested soil and tomato roots were added to The experimental design was a complete all plots. In 1980, field plots were infested randomized block with six replications and and planted 5 June, sampled for nematodes six cultivars (Porto Rico, Travis, Centen- 27 June, 4 August, 29 August, and 6 Octo- nial, Goldrush, Jasper, and Jewel). Plots ber, and harvested 10 October. In 1981, were planted on 18 May; soil was sampled plots were infested and planted 23 May, 29 March, 18 May, 18 June, 17 July, and sampled for nematodes 16 June, 16 July, 14 17 August; and plots were harvested 17 August, and 14 September, and harvested September. 24 September. In 1980 and 1981, field plots were estab- In a second field test in 1981, a row was lished by artificial infestation of plots after selected with a high natural population fumigation with 134 kg/ha Terr-O-Gas 67 density of Rr (2,700/250 cm 3 on 8 April) (67% methyl bromide, 31.8% chloropicrin) but no detectable Mi. The experimental injected 20 cm deep, using a single chisel. design was a complete randomized block The beds were covered with 1.5-mil black with four replications. Half of the plots polyethylene until 10 days prior to plant- were fumigated with 1,3-dichloropropene ing. Ethoprop (6EC) was sprinkled at the (Telone If) at the rate of 46.7 1/ha with rate of 7.0 kg a.i./ha between the beds in a hand held fumigation gun. Meloidogyne 1980. Both tests were set up as completely incognita-infested soil and roots were added randomized block designs with four repli- to give a level of 4,000/250 cm 3 soil. Treat- cations in 1980 and six in 1981. Three ments included fumigation, nonfumigation, cultivars--Porto Rico, Jasper, and Gold- fumigation + Mi, and nonfumigation + rush-were planted in 1980, and Porto Rico Mi. Planting, soil sampling, and harvest alone was planted in 1981. Treatments in- dates were the same as for the first 1981 test. cluded inoculation with Mi alone, Rr alone, Vine growth was rated visually on 8 July Rr + Mi, and noninoculated. on a relative scale (from 0 -- no growth Inoculum of a Louisiana population of to 4 -- greatest growth) when vine growth Mi (race 1) was increased by inoculating reached the middle of the rows. 23-day-old 'Rutgers' tomato seedlings with In both 1981 tests, samples of small cull 10,000 eggs in ]5-cm-d pots. After 43 days, fleshy roots (2.5 cm d) were pureed in a 206 Journal o] Nematology, Volume 15, No. 2, April 1983 Waring blender, and nematodes and eggs cracks (23%) than the other cultivars which were screened through 425-/tm sieves onto ranged from 2 to 8%. 38-/~m sieves, processed by sucrose centri- 1980 field test: Nematode population fugal flotation, and stained with acid- counts were not different among cultivars, fuschin-lactophenol. Also, larger market- therefore data for the three cultivars were able size fleshy roots were sliced in 0.5-1.0 pooled (Fig.
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