Laboratory experiments were conducted to determine the phytotoxic activity of water leachates from Mexican sunflower (Tithonia diversifolia) leaves and the effect of water movement on efficacy of the leachate in soil. The water leachates from both the green and senescent leaves applied onto soil...

Soil material and plant tissue were collected along transects in two heavily contaminated facilities, a Superfund site and a lead-acid battery dump, and analysed for metal content. Soil Pb, Cd and Ba concentrations for the Superfund site averaged 55 480, 8.5 and 132.3 mg/kg, respectively. Soil Pb...

Sand and clay loam soil columns were established using P. cryptogea from kiwifruits to assess the mobility of phenylamide fungicides. Mobility appears to be a function of the chemical nature of the fungicide and soil texture. Regardless of the soil type, metalaxyl was highest, ofurace was...

In greenhouse trials, pre-em. pyributicarb, applied at 0.75-1.5 g/a under flooding conditions, exhibited outstanding herbicidal activity against Echinochloa oryzicola [E. oryzoides], Cyperus difformis, Monochoria vaginalis and a mixture of broadleaved weeds (including Lindernia pyxidaria, Rotala...

A laboratory technique is described in which 'soft' radiographs are used to study movement patterns of Melanotus communis, a pest of maize, within a soil matrix. The advantages of this technique as compared with destructive sampling are discussed and examples of several possible applications are...

Anguina tritici larvae travelled a maximum of 7-19 cm in the seven trials reported. 75% travelled no further than 1 cm, and only 2.4% travelled beyond the 6th cm. The duration of the trial was not an important factor limiting the distance travelled. Attraction by the host plant did not appear to...

A study of Plasmopara helianthi spread in a sunflower crop was carried out following Van der Plank's method. In a highly infected sloping field the spread of the parasite preferentially followed the slope lines. With few exceptions, all slopewise sequences of data are significant by the Van der...

A semi-quantitative method was developed to estimate the relative numbers of resting sporangia of O. brassicae in the soil. There were more propagules in a big-vein-prone (BV-P) soil than in a big-vein-intermediate (BV-I) soil and virtually none in a big-vein-suppressive (BV-S) soil. Similar...