Abstracts of papers presented at the 9th Conference of the Weed Science Society of Israel Abstracts of papers presented at the 5th Conference of the Vegetable Virus Working Group of the International Society for Horticultural Science (ISHS), on Recent Advances in Vegetable Virus Research

Joel, D. M.; Liston, Aaron; Zinzolker, A.; Kigel, Jaime; Rubin, Baruch; Givelberg, Assia; Poljakoff‐Mayber, A.; Lior, E.; Shaaltiel, Yoseph; Gressel, Jonathan; Yaacoby, Tuvia; Schönfeld, Mordechay; Lewinsohn, Efraim; Casida, John E.; Tal, A.; Rubin, B.; Katan, J.; Aharonson, N.; Erez, A.; Monselise, S. P.; Shulman, Y.; Nir, G.; Lavee, S.; Ohaly, J.; Pressman, E.; Aviram, H.; Zahavi, U.; Bahat, A.; Kleifeld, Y.; Herzlinger, G.; Blumenfeld, T.; Graph, S.; Bargutti, A.; Abada, M.; Rosenberg, U.; Kleifeld, O.; Fridmann, Y.; Retig, B.; Lehrer, W.; Brosh, S.; Zilberstein, J.; Hadar, Esther; Boshwitz, Y.; Bucsbaum, H.; Regev, Yael; Putievsky, E.; Nir, A.; Raz, A.; Horowitz, M.; Weiss, Yoram; Gottlieb, A.; Solomon, David; Keren, Y.; Koren, Ephraim; Mermelstein, M.; Ovadia, Steven; Goldschmidt, Yaaqov; Biratti, Y.; Karni, Y.; Sheinbaum, Y.; HollÄnder, E. F.; Rothschild, Ghl; Yitach, N.; Gogenheim, Y.; Milne, Robert G.; Maoz, Asher; Rosner, A.; Raccah, B.; Bar‐Joseph, M.; Delécolle, Brigitte; Lot, H.; Marie-Joséemichel,; Sequeira, J. C.; Horváth, J.; Sharma, Debi; Kyriakopoulou, P. E.; Vetten, H. J.; Breyel, E.; Lesemann, D.-E.; Maiβ, E.; Weidemann, H. L.; Bos, L.; Dijk, Pieter Van; Matthieu, J. L.; Taghouachti, H.; Borges, Maria L. V.; Duffus, James E.; Conti, M.; Caciagli, P.; Foddai, Antonio; Fresu, B.; Paludan, N.; Thomas, J. E.; Maury-Chovelon, Véronique; Gracia, Olga; Feldman, J. M.; Marco, S.; Mullen, J. B.; Hagedorn, D. J.; Muehlbauer, F. J.; Walkey, D. G. A.

doi:10.1007/bf02980674

Cited by 6 publications

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Comparing after‐ripening response and germination requirements of Conyza canadensis and C. bonariensis (Asteraceae) through logistic functions

Karlsson

Milberg

2007

Weed Research

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SummaryGermination requirements and after-ripening effects during one year of dry storage at 15/5 and 25/15°C (day/night) were compared for Conyza bonariensis and C. canadensis (Asteraceae). A logistic function was fitted to the results from tests over time in various incubation conditions, using three populations of each species as replicates. Time required for response to dry storage was measured by using a new method; the third derivative of the logistic function. Therefore, a point when major germination was achieved could be detected, without having to rely on maximum germination (which is uncertain), individual data points or any subjectively chosen limit. Fresh seeds of both species were dependent on light for germination and after-ripening was mainly manifested by increasing germination in darkness. Low dormancy status and light requirement might indicate that soil cultivations should rapidly reduce the seed banks of these species, although fecundity and wind dispersal will affect population levels. The species differed in their germination response, with C. bonariensis germinating at lower temperatures than C. canadensis. This seemingly counter-intuitive result may explain the prevention of fatal germination of C. canadensis in cold conditions and its behaviour as a summer annual in northern climates, while C. bonariensis is restricted to warmer parts of the world.

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Comparing after‐ripening response and germination requirements of Conyza canadensis and C. bonariensis (Asteraceae) through logistic functions

Karlsson

Milberg

2007

Weed Research

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Germination, persistence, and emergence of flaxleaf fleabane (Conyza bonariensis [L.] Cronquist)

Wu¹,

Walker²,

Rollin

et al. 2007

Weed Biology and Management

106

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Flaxleaf fleabane (Conyza bonariensis [L.] Cronquist) is a difficult-to-control weed in dryland minimum tillage farming systems in the northern grains region of Australia. Experiments under field and controlled environments were conducted to study the seed germination, emergence, and persistence of C. bonariensis.The base, optimum, and maximum temperatures for seedling germination were estimated at 4.2, 20, and 35°C, respectively, with light stimulating germination.The soil types and burial depths had significant effects on seed persistence and emergence. The persistence pattern showed an initial rapid drop, followed by a slow but steady decline over time.After 3 years of burial, there were ª 7.5%, 9.7%, and 1.3% viable seeds at 10, 5, and 0-2 cm soil depths, respectively. Conyza bonariensis predominantly emerged from the soil surface or from the burial depth of 0.5 cm.Very few seeds emerged from a depth of 1 cm and none emerged from Ն 2 cm. The emergence was greater in lighter soils. On-farm monitoring of the field emergence over time in a light sandy loam soil showed that 99% emergence occurred in late autumn, early and late winter, and a small fraction of 1% emerged in mid-spring. The predominant emergence from the soil surface suggests that the fleabane problem is a result of weed species shift toward the minimum tillage systems that provide moist conditions for better emergence compared to conventional tillage systems.The seed longevity of at least 3 years in the soil and the prolonged emergence patterns between autumn and spring have posed great difficulties for the long-term management of C. bonariensis.

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Analysis of the agronomic interest characteristics for the management of Conyza blakei, Conyza bonariensis, Conyza sumatrensis, and Conyza lorentzii

et al. 2020

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Conyza genus includes herbs of ruderal habit, also referred to weeds in pastures, perennial crops, and no tillage crops. The insuitable use of herbicides, the incorrect identification of species, and the lack of monitoring, among others, explain the fact that Conyza species have become a growing problem in production systems under no tillage. Therefore, the knowledge of biology and the adaptive response to diverse cultural practices is paramount. Two of the most important characteristics to establish management guidelines are the height and growth stages of these species,since their herbicides sensitivity have been associated with these characteristics. The objective of this work was to analyze the results that affect the reproductive success (germination%, fecundity), and the most effective weed control time (height and determination of the phenological stages) of Conyza blakei, C. bonariensis, C. lorentzii and C. sumatrensis. Trials were conducted at the Agricultural Experimental Station of Balcarce, INTA, Argentina. We analyzed 35 individuals of each species. The germination % presented significant differences, being C. sumatrensis, the specie with the highest number of emerged seedlings. The phenological stages also showed differences, being C. bonariensis the species that began to elongate the stem earliest, the first in flowering, and the greatest fecundity. The senescence of the 4 species occurred within the first year of growth. The species with greater reproductive success would be C. bonariensis and C. sumatrensis, requiring the first earlier practices of controls.

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Abstracts of papers presented at the 9th Conference of the Weed Science Society of Israel Abstracts of papers presented at the 5th Conference of the Vegetable Virus Working Group of the International Society for Horticultural Science (ISHS), on Recent Advances in Vegetable Virus Research

Cited by 6 publications

References 0 publications

Comparing after‐ripening response and germination requirements of Conyza canadensis and C. bonariensis (Asteraceae) through logistic functions

Comparing after‐ripening response and germination requirements of Conyza canadensis and C. bonariensis (Asteraceae) through logistic functions

Germination, persistence, and emergence of flaxleaf fleabane (Conyza bonariensis [L.] Cronquist)

Analysis of the agronomic interest characteristics for the management of Conyza blakei, Conyza bonariensis, Conyza sumatrensis, and Conyza lorentzii

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