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Field Protection of Cucumber, Watermelon, and Muskmelon Against Colletotrichum lagenarium by Colletotrichum lagenarium
| Content Provider | Semantic Scholar |
|---|---|
| Author | Caruso, Frank L. |
| Copyright Year | 1977 |
| Abstract | CARUSO, F. L., and J. KUC. 1977. Field protection of cucumber, watermelon, and muskmelon against Colletotrichum lagenarium by Colletotrichum lagenarium. Phytopathology 67:1290-1292. In three separate field trials, cucumber plants were protected. Lesions produced on protected plants were partially protected against a challenge inoculation with reduced in number and size compared to those produced on Colletotrichum lagenarium by a prior inoculation with the unprotected plants. This protection phenomenon seems to be pathogen. Protection of watermelon was evident in two trials expressed in the field as well as in the greenhouse. and indications were that muskmelon also could be Additional key words: biological control, immunization. Systemic protection by Colletotrichum lagenarium both leaf surfaces of the entire plant above ground until against C. lagenarium has been demonstrated in runoff and the plants were enclosed in plastic bags to cucumber (5, 6), watermelon (2), and muskmelon (2). maintain high humidity. Newspaper was placed over the Since these reports concerned greenhouse experiments plants to reduce day temperatures inside the bags. Bags under controlled conditions, it was important to were removed after 24 hr. Three separate field trials were determine whether this phenomenon could be conducted. demonstrated in the field. This paper indicates that Trial 1 (1975).-Water or protective inoculum (10' protection also can be elicited under field conditions. spores/ml) was sprayed on the first true leaf of cucumber Preliminary reports of this have been published (1, 4). (SMR 58 and Marketer), watermelon, and muskmelon plants. Ten days after planting, all leaves of protected MATERIALS AND METHODS plants were sprayed with a booster protective inoculum of 104 spores/ml ; at this stage, there were six leaves per Pathogen and hosts.--Colletotrichum lagenarium plant. Seven days after the booster inoculation, plants (Pass.) Ell. & Halst. (race 1) was maintained on bean pod were sprayed with challenge inoculum (5 X 105 spores/ml) agar at 24 C in the dark. Spore suspensions were prepared or water. There were four treatments: (i) from 6to 14-day-old cultures. protected/challenged (P/B/C-inoculated on the first leaf, Cucumbers (Cucumis sativum L. 'Wisconsin SMR 58' received booster and challenge inoculations); (ii) and 'Marketer'), watermelons (Citrullus vulgaris Schard. protected/unchallenged (P/ B/ UC-inoculated on the first 'Sugar Baby') and muskmelons (Cucumis melo L. leaf and received booster inoculation); (iii) 'Iroquois') were tested. Plants were grown in 10-cm unprotected/challenged (UP/C received only the diameter plastic pots containing a mixture of challenge inoculation); and (iv) soil:peat:sand (2:1:1, v/v) or Pro-Mix BX (Premier unprotected/unchallenged (UP/UC not inoculated). Brands, Inc., Premier Peat Moss Corp., New York, NY There were three replicates of 25 plants per treatment. 10036). Plants received nutrient solution (Ra-Pid-Gro, The number of lesions per leaf and the number of leaves Dansville, NY 14437) every 2 wk and were maintained in a with lesions were counted 9 days after the challenge greenhouse at 23-31 C with daylight supplemented with inoculation. 14 hr of fluorescent and incandescent light. Trial 2 (1976).-Leaf one of cucumber (SMR 58) and Inoculations.--Except as noted, the first true leaf of muskmelon plants was sprayed with protective inoculum plants (in the two-leaf stage) was inoculated as described (106 spores / ml) or water. Twelve days after transplanting, (5). One wk after the first leaf had been inoculated, plants plants were sprayed with challenge inoculum (10' were transplanted to the field and shaded for 2 days. spores/ ml ) or water. Four treatments were established: Plants were set in rows 2.5 m apart and were individually UP/C, P/C, P/UC, and UP/UC. There were 18 and 14 spaced 2.5 m apart in the row. Challenge inoculations plants per treatment with cucumber and muskmelon, were done at dusk. Inoculum was sprayed on stems and respectively. Symptoms were rated 0-5:0 = no symptoms; 1 = trace -20% of leaf area covered by lesions; 2 = 20-40%; Copyright © 1977 The American Phytopathological Society, 3340 3 = 40-60%; 4 = 60-85% with growing point alive; 5 = 85Pilot Knob Road, St. Paul, MN 55121. All rights reserved. 100% or complete death. Eleven days after challenge, |
| Starting Page | 1290 |
| Ending Page | 1290 |
| Page Count | 1 |
| File Format | PDF HTM / HTML |
| DOI | 10.1094/Phyto-67-1290 |
| Volume Number | 77 |
| Alternate Webpage(s) | http://www.apsnet.org/publications/phytopathology/backissues/Documents/1977Articles/Phyto67n10_1290.PDF |
| Alternate Webpage(s) | https://doi.org/10.1094/Phyto-67-1290 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
