. Control of diabrotica, or Western spotted cucumber beetle, in deciduous fruit orchards. Diabrotica; Diabrotica; Fruit. 24 University of CaliforniaâExperiment Station as the dust is applied and it is doubtful whether these receive a lethal dose. It was further found that the direction of the dust drift was a very important factor. It is necessary 1 hat the drift be away from the untreated portion of the orchard. This is true because a very small amount of an effective dust will cause the beetles to drop from the trees; these insects do not receive a lethal dose, and as soon as it warms up in
. Control of diabrotica, or Western spotted cucumber beetle, in deciduous fruit orchards. Diabrotica; Diabrotica; Fruit. 24 University of CaliforniaâExperiment Station as the dust is applied and it is doubtful whether these receive a lethal dose. It was further found that the direction of the dust drift was a very important factor. It is necessary 1 hat the drift be away from the untreated portion of the orchard. This is true because a very small amount of an effective dust will cause the beetles to drop from the trees; these insects do not receive a lethal dose, and as soon as it warms up in the morning they recover and fly back into the trees. Under any condition dusting should be stopped as soon as the direc-. ^^/^^^^^^/^ - PATH OF DUSTER â (§k <§k Fig. 16.âDiagram of an orchard showing the patli that the duster should follow in relation to the direction of the dust drift. tion of the drift changes so that it goes through the undusted part of an orchard. This must be done even though the dusting operation has just been started. The amount of dust in t he air from dusting one row if drifted through the orchard is sufficient to knock most of the beetles from the trees. Because the direction of drift is so important, considerable time should be spent in determining this be lore beginning operations. In early morning the drift may be veiy variable and within 5 minutes it may shift to any point of the compass. However, on most mornings the drift finally stabilizes in one direction. The direction of drill can be accurately determined by taking a small amount of dust in the palm of the hand and then clapping the hands to create a cloud of dust. Or the drift of tobacco smoke can be noted. If, after a few minutes, it is found that the drift remains constant, dusting can be started. The farmer. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illust
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