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| Titel: |
Effect of leaf growth in cucumber on deposit dilution and the control of angular leaf spot |
| Auteur: |
Mabbett, T. H. Phelpst, R. H. |
| Verschenen in: |
International journal of pest management |
| Paginering: | Jaargang 30 (1984) nr. 4 pagina's 444-449 |
| Jaar: |
1984-12 |
| Inhoud: |
Tropically grown cucumber exhibits massive increases in foliar area within a short space of time. New leaves are produced at a rate of 1 leaf/vine/day and emerging leaves expand by a factor of 20 within 4-5 days. Foliar protection using the traditional 10-day spray interval is difficult because many leaves remain unprotected throughout their main period of growth and deposits applied to newly emerged leaves are diluted to inactive levels within several days. Angular leaf spot poses particularly acute problems because it spreads and develops most rapidly when deposits are under the most intense weathering pressure, and its appearance on the leaves coincides with the stage of rapid leaf expansion. Indications are that control may be improved by shortening spray intervals to four or five days so that all leaves receive spray during the critical 4-6 days after emergence when they are susceptible to angular leaf spot but have already completed most of their expansion. Increased costs through higher spray frequency would be offset by using low-volume mistblow-ers instead of high-volume knapsack sprayers. A programme of sprays consisting of cupric hydroxide as Kocide 101 at a spray concentration of 1.0% w/v and applied by l.v. mistblower every 4-5 days is recommended for future evaluation. Ultra-low-volume methods employing ultra-low dosages of copper appear to be unsuitable for this particular crop disease situation because the initial small, deposits are diluted to inactive levels, even with reduced spray intervals. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 10 van 28 gevonden artikelen
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