Mulching the soil with polyethylene sheets before sowing during the hot season, increased the soil temperatures, which resulted in the control of soil-borne pathogens and weeds. This method was tested in a field heavily infested with Egyptian broomrape ( Orobanche aegyptiaca L.). Soil was irrigated and mulched for 36 days during August–September 1977, prior to sowing carrot ( Daucus carota L. ‘Nantes Tip Top’) seeds. Mulching increased soil temperatures by 8 to 12 C, up to 56 C in the top 5 cm. In the non-mulched plots the carrot plants became stunted due to heavy parasitization with broomrape and they were completely destroyed by the end of the season. In contrast, broomrape and other weeds were controlled in the mulched plots and the carrot plants grew normally. This effect was less pronounced in the border rows of the mulched plots. Mulching also greatly reduced the infestation of other weeds. Egyptian broomrape was also controlled in two other field experiments with carrots and eggplants ( Solanum melongena L. ‘Black oval’). As compared with fumigation, this new method of control is economical, simple, nonhazardous, and does not employ toxic materials.

Daucus carota

Soil solarization

Cultural control

10.1017/s0043174500055351

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Citations (93)

Quantitative determination of broomrape (Orobanche spp.) seeds in vetch seeds

Weed Research (1988)

R. Jacobsohn Ruth Marcus

Summary: Résumé: Zusammenfassung A method was developed by which the presence of broomrape ( Orobanche spp.) seeds in vetch seeds was determined quantitatively. The broomrape seeds are washed out of the vetch seeds by a combination of two sieves. The vetch seeds remain on the top sieve and the broomrape seeds are collected on the lower sieve with square openings of 100 μm, which do not permit passage of the broomrape seeds. An appropriate statistical method for estimating the true mean number of broomrape seeds per sample in a large vetch seeds lot is presented and discussed. Détermination quantitative des graines d' orobanche dans des graines de vesce. Une méthode permettant de dénombrer la présence de graines d' orobanche dans un lot de graines de vesce a été mise au point. Les graines d'orobanche sont séparées de celles de vesce par une succession de deux tamis. Les graines de vesce sont maintenues sur le tamis supérieur et les graines d' orobanche sont collectées sur le tamis le plus bas avec une maille de 100 μm qui ne permet pas le passage des graines d' orobanche. Une méthode statistique appropriée pour estimer la quantité réelle d' orobanches dans un grand lot de semences de vesce est présentée puis discutée. Quantitative Bestimmung von Orobanche‐ Samen in Wicken‐Saatgut Es wurde eine Methode entwickelt, mit der Orobanche ‐Samen in Wicken‐Saatgut quantitativ erfasst werden können. Zum Trennen der Samen wurden 2 Siebe verwendet, wobei die Wicken‐Samen im oberen, die Orobanche ‐Samen im unteren mit einer Maschenweite von 100 μm gesammelt wurden. Eine statistische Methode für die Schätzung der Orobanche ‐Samenmenge in grossen Wicken‐Saatgutpartien wurde vorgestellt und diskutiert.

Orobanche

Parasitic plant

10.1111/j.1365-3180.1988.tb01601.x

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Citations (9)

Variation between and within broomrape (Orobanche) species revealed by RAPD markers

Heredity (1997)

Ilan Paran David Gidoni R. Jacobsohn

Orobanche

Parasitic plant

Genetic Variability

Orobanchaceae

10.1038/hdy.1997.8

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Citations (38)

Distribution, host range and phenology of Orobanche spp. in Nepal.

G. Khatri Prashant Jha V. P. Agrawal R. Jacobsohn K. Wegmann

Orobanche

Source

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Citations (2)

Effect of Broomrape (Orobanche spp.) Infection on Sugar Content of Carrot Roots

HortScience (1991)

A. A. Schaffer R. Jacobsohn D.M. Joel E. Eliassi Miriam Fogelman

The soluble sugar content of mature carrot roots (Daucus carota L. cv. Ti-To, Nantes type) grown in broomrape-infested or noninfested soil was measured. Orobanche aegyptiaca Pers. (Egyptian broomrape) and O. crenata Forssk. (crenate broom-rape) decreased the total sugar content similarly. Sucrose was the primary sugar in noninfected roots and its level was greatly reduced in infected roots. Concentrations of sucrose were higher in the cortex than in the core; broomrape infection reduced sucrose concentration in both portions of the root. Even broomrape-infected roots with a healthy appearance (acceptable size and color) had a greatly reduced sucrose content. These results show that broomrape infection can reduce carrot root quality even when the visual appearance of the root is not affected.

Daucus carota

Orobanche

10.21273/hortsci.26.7.892

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Citations (13)

Growing Broomrape (Orobanche spp.) in a Soilless System

Weed Technology (1990)

R. Jacobsohn Chester L. Foy Kela Marton

A soilless unit was devised in which host plant (carrot, tomato) roots can be readily infected with broomrape. The simple, inexpensive and reusable unit consists of two glass plates, synthetic cloth, and foam rubber. The host plants are placed (or grown) between the glass plates, being held against one of the plates by foam rubber. The unit provides proper growing conditions, convenient visibility of host roots and parasite from an early stage of infection, and nondestructive access to the roots and parasite. Exposure of the broomrape seeds to a synthetic germination stimulant (GR 24) prior to their application to the host roots, generally, but not always, caused some increase in the number of parasitic infections and/or the rate of broomrape growth.

Orobanche

Parasitic plant

Hydroponics

10.1017/s0890037x00026439

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Citations (5)