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Effect of Sulfonylurea Herbicides on Egyptian Broomrape (Orobanche aegyptiaca) in Tomato (Lycopersicon esculentum) under Greenhouse Conditions

  • Joseph Hershenhorn (a1), Yaakov Goldwasser (a1), Dina Plakhine (a1), Yael Lavan (a1), Geza Herzlinger (a1), Shmuel Golan (a1), Taha Chilf (a1) and Yeshaiahu Kleifeld (a1)...

Abstract

A time course of Egyptian broomrape development on tomato roots grown in pots in the greenhouse revealed an increase in the number of parasitic attachments from 2.6 at 4 weeks after planting (WAP) to 139 when rated 2 wk later. Rimsulfuron sprayed on tomato foliage as single and split applications (12.5 g ai/ha) 3, 4, 5, 6, and 7 WAP did not decrease Egyptian broomrape damage to tomato plants, as expressed by reduced tomato plant height and fresh weight, and the total number of parasitic attachments on the roots was not significantly different compared to the nontreated control. A single foliar application of rimsulfuron (25 g ai/ha) to tomato at 10 days after planting (DAP) and split applications at 10 and 20 and 10, 20, and 30 DAP significantly reduced the number of Egyptian broomrape inflorescences to 2.2, 0.2, and 0, respectively, 9 WAP compared with 19.6 inflorescences in the nontreated control. Application of the herbicide under the same conditions to tomato plants in pots covered with activated charcoal did not significantly influence the number of Egyptian broomrape inflorescences. Chlorsulfuron and triasulfuron applied directly to the soil at rates ≥ 3: 3.75 g ai/ha completely controlled Egyptian broomrape. Primisulfuron and chlorimuron, each at 22.5 g ai/ha, reduced the number of inflorescences to 0.6 and 0.4, respectively. Chlorimuron did not significantly reduce the total number of parasitic attachments on the roots, but primisulfuron at the same concentration significantly increased the total number of parasitic attachments on the root system to 50 as compared to 23 in the nontreated control. Tribenuron had no effect on the parasitism process, as reflected in the number of inflorescences and parasitic attachments on the roots.

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Effect of Sulfonylurea Herbicides on Egyptian Broomrape (Orobanche aegyptiaca) in Tomato (Lycopersicon esculentum) under Greenhouse Conditions

  • Joseph Hershenhorn (a1), Yaakov Goldwasser (a1), Dina Plakhine (a1), Yael Lavan (a1), Geza Herzlinger (a1), Shmuel Golan (a1), Taha Chilf (a1) and Yeshaiahu Kleifeld (a1)...

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