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ASTM Selected Technical Papers
Pesticide Formulations and Application Systems: Global Pest Control Formulations for the Next Millennium: Nineteenth Volume
By
RS Tann
RS Tann
1
Exxon Chemical Company
,
Houston, TX
;
symposium chairman and editor
Search for other works by this author on:
JD Nalewaja
JD Nalewaja
2
North Dakota State University
,
Fargo, ND
;
symposium co-chairman and editor
Search for other works by this author on:
AK Viets
AK Viets
3
Bayer Corporation
,
Kansas City, MO
;
symposium chairman-elect and editor
Search for other works by this author on:
ISBN-10:
0-8031-2622-0
ISBN:
978-0-8031-2622-0
No. of Pages:
160
Publisher:
ASTM International
Publication date:
1999

Metsulfuron-methyl has been suggested as a new experimental abscission chemical for harvesting Florida citrus fruit. The objective of the research was to determine the effects of spray droplet size and active ingredient (a.i.) concentration on the efficacy of the product.

‘Hamlin’ and ‘Valencia’ orange explants (fruit with peduncle) were sprayed using different droplet sizes or dipped in metsulfuron-methyl solution at three concentrations. Treatment solutions also contained adjuvants Kinetic and Buffer Xtra. The treated explants were stored under constant temperature and humidity conditions and assayed at 3, 5, 7, 9 or 10 days. The metsulfuron-methyl induced internal ethylene was measured by gas chromatography and used as response variable.

Droplet size, a.i. concentration and measurement day had significant effects on ethylene production. Although the response was highly variable, ethylene production tended to increase with droplet size and metsulfuron-methyl concentration. Overall, the variability of response increased at the higher concentrations.

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