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In field trials in the UK, different levels of attack by hymenopterous parasitoids occurred in stem-boring larval Diptera (including Oscinella frit) i...
Read moreAn analysis of predation of cereal aphids (Sitobion avenae and Metopolophium dirhodum) by larvae of Episyrphus balteatus is described. Field data on t...
Read moreThere is a linear relationship between the timing of the spring migration of both Sitobion avenae and S. fragariae and latitude, due to the effect of ...
Read moreSoils supporting Rhizophora racemosa, R. harrisonii, R. mangle and Avicennia germinans are described. When they are drained, soils which have carried ...
Read moreBird numbers were estimated on areas adjacent to conifer plantations at 62 sites, each of 640 ha, in three areas of northern Scotland. The results var...
Read moreOn each of two sites in western Texas, 240 Juniperus pinchotii plants were harvested. The competitive influence of herbs and shrubs associated with ea...
Read moreAn approximate solution is presented of the differential equation describing soil-moisture flow towards a root absorbing water at a periodically varyi...
Read moreHoney-bee colonies in fruit orchards (apple and plum) often collect much dandelion pollen. Bees visiting dandelion become conditioned to it and, even ...
Read moreChanges in the Marais Poitevin wetland, France, are described. The area of grasslands decreased by 50% between 1970 and 1995, principally as a result ...
Read moreThe weed flora of the unsprayed field margins of 19 fields in arable crop rotations was studied in Denmark in 1988-92. The farmer determined the crop ...
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