By J. Kroschel (auth.), Jürgen Kroschel (eds.)

Parasitic weeds of the households Cuscutaceae, Orobanchaceae and Scrophulariaceae are thought of to be one of the significant difficulties dealing with agriculture within the Tropics and Subtropics. within the final a long time, huge, immense efforts were made and good fortune accomplished via scientists world wide in gaining a greater knowing in their biology and ecology in addition to of keep an eye on tools. although, no enormous aid of infestation has been completed long ago and keep watch over options particular to different parasites, vegetation and farming platforms needs to be additional built or tailored and realised between a much wider farming inhabitants with compatible extension tools. This `Technical guide' presents up to date methodologies for varied points of study and extension concerning parasitic weed species of the genera Striga, Alectra, Orobanche and Cuscuta. It has the purpose to aid scientists and extension employees of foreign and nationwide examine and extension institutes and universities, who're both new to the topic or plan to use extra thoughts they don't seem to be but accepted with.

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Reliable results require the comparison of germination and viability tests. • Never confuse germination with viability! LITERATURE Aalders AJG & R Pieters 1985. In vitro testing with 2,3,5-triphenyl tetrazolium chloride (TTC) of Orobanche crenata seed metabolism. FABIS Newsletter 13: 35-37. Bebawi FF, RE Eplee, CE Harris & RS Norris 1984. Longevity of witchweed (Striga asiatica) seed. Weed Science 32: 494-497. Bischof F 1984. Untersuchung zur Bestimmung der Keimfahigkeit von Samen einiger Orobanche-Arten.

The relative total yield loss is the product of three factors: • the infestation rate, • the infection intensity, and • the relative yield reduction per plant stand or m2 • The absolute economic losses faced by the farm households and the entire regional economics further depend on ( 1) the potential yield of the different crops, (2) the actual acreage covered by these crops, and (3) crop prices. 1 ). In addition, yield assessments have to be carried out in single fields comparing weed-free (non-infected) plant stands with weed-infected ones (Fig.

Beside plant height this may include: Maize: number of cobs, cob and seed weight Sorghum: panicle and seed weight Rice: number of panicles per m2 , seed weight per m2 r7' Faba bean: number of pods/plant, seed weight, number of plants per m2 the yield in the presence of pests and weeds is (yi), crop loss (w) may be defined as the reduction in (m), expressed as a percentage of it: EVALUATION * A quantified parasitic weed (or pest) Crop loss (w)% =m-Y; xlOO density (i) operates on the crop yield (y) in a typically linear regression: m * Check data for normal distribution and then conduct an analysis of variance and subsequent Tukey-test.

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