Read e-book online A Technical Manual for Parasitic Weed Research and Extension PDF

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 completed through scientists around the globe in gaining a greater realizing in their biology and ecology in addition to of keep watch over equipment. notwithstanding, no tremendous aid of infestation has been completed some time past and regulate ideas particular to the various parasites, plants and farming structures needs to be extra built or tailored and realised between a much wider farming inhabitants with compatible extension tools. This `Technical handbook' presents up to date methodologies for numerous facets of analysis and extension concerning parasitic weed species of the genera Striga, Alectra, Orobanche and Cuscuta. It has the goal to help scientists and extension staff of overseas and nationwide study and extension institutes and universities, who're both new to the topic or plan to use extra concepts they aren't but favourite with.

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38 rJF In these Petri dish place the discs that contained preconditioned seeds (described above) after drying on filter paper to remove any excess water. r:Ir The Petri dishes are then enclosed in black plastic, firmly closed to prevent water losses and incubated in the dark at different temperature regimes and duration of storage depending on the parasitic weed species: Striga: 30°C for 1-2 days Oro banehe: 23-25°C for 7 days 25-30°C for 3 days Alectra: see preconditioning of Cuscuta: seeds. EVALUATION * Score a seed as germinated if the root tip (radicle) has protruded through the seed coat.

PROCEDURE rJr The collection should be started 2-3 weeks after the parasite began to flower in the region. Prospection rJr A plant is mature when there are none or only few apical flowers left and the capsules are still intact. The collection is preferably done from fields with the same host plants as will be used later in the experiment. The plants should be transported in paper bags and then sun dried at the station. When the plants are dry, either the entire spikes (Orobanche) or only the heads with the capsules (Oro banehe, Striga) are threshed by hand in plastic bags or sacks.

Progress in Orobanche research. Eberhard-Karls-Universitat, Ttibingen, Germany, 92-98. Reuter, BC 1986. The habitat, reproductive ecology and host relations of Orobanche fasciculata Nutt. (Orobanchaceae) in Wisconsin. Bulletin of the Torrey Botanical Club 113(2): 110-117. 2 Seed collection INTRODUCTION For most experiments with parasitic plants their seeds are a prerequisite. A certain amount of stored seed is therefore an essential basis for successful experimentation. OBJECTIVE • o obtain a standard quality and quantity of seed of parasitic plants.

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