. Les canneberges ; : la canneberge national magazine. La canneberge. Vittum (Univ. de Massachusetts) et Joseph Weaver (Université de Virginie occidentale), qui ont tous deux à l'essai sur le terrain d'une vaste gamme d'insecticides contre les vers blancs dans la pelouse, Oftanol® et Triumph® doit être considéré comme de bons candidats pour de futurs essais de canneberges. Deuxièmement, les chercheurs doivent garder à l'esprit que certains insecticides fonctionnent mieux dans les sols sableux alors que d'autres font bien dans les sols composé principalement de matière organique. Dans les sols sablonneux, des taux d'insecticide sont souvent nécessaires pour compenser les montants perdus par lessivage. Dans les sols organiques- type, beaucoup d'insectici

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. Cranberries; : the national cranberry magazine. Cranberries. Vittum (Univ. of Mass.) and Joseph Weaver (Univ. of West Virginia), both of whom have field tested an array of insecticides against grubs in turfgrass, Oftanol® and Triumph® should be considered prime candidates for future cranberry trials. Second, researchers need to keep in mind that certain insecticides perform best in sandy soils while others do well in soils composed mainly of organic matter. In sandy soils, higher rates of insecticide are often needed to offset amounts lost via leaching. In organic- type soils, many insecticides become bound to or "tied up" on organic matter near the surface. Once this occurs, no amount of precipitation or irrigation water can release the insecticide and wash it into lower layers of soil where grubs are feeding. Injection of insecticides is sometimes a way to overcome this problem. Lastly, the extensive damage inflicted by grubs prior to the use of dieldrin should not necessarily be expected to recur in the future, even in the absence of efficacious insecticides. Improved bog management practices give reason for being optimistic. Growers today fertilize and irrigate frequently, producing vigorous vines which are able to tolerate a goodly amount of root injury over several years. In contrast, growers years ago rarely fertilized bogs and only occasionally flooded them during hot summer months. Already in a stressed state, vines subjected to grub feeding readily succumbed, often within the same growing season. In addition to stimulating vine growth, growers today reduce the number of competitive plants on bogs by judiciously applying pre- and post- emergence herbicides. Certain of these selectively kill grasses which attract white grubs. Years ago, in contrast, grasses which thrived on bogs increased the likelihood of invasion and successful colonization by white grubs. In summary, the field trials of 1984 showed that diazinon 14G and Lorsban 150 were not

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