Procedure for Mass Rearing of Adults of Tiphia Vernalis Roh., A Japanese Beetle Parasite (Classic Reprint) - Softcover

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Excerpt from Procedure for Mass Rearing of Adults of Tiphia Vernalis Roh., A Japanese Beetle Parasite

The number of factors influencing the cost of obtaining host material makes an exact estimate impossible. The quantity of grubs available in the soil is but one of these factors. At the Moorestown laboratory experience has shown that for efficient digging the grub population should be well above 10 grubs per square foot. In some cases it may be profitable to transport the diggers considerable distances in order to find continuous digging where the population is sufficiently high.

The depth at which the grubs are found is a strong limiting factor. The deeper they are, the more soil must be moved before actual production begins. From May I to the first week in June, and again from the first week in September to early in October, grubs may be scratched from the top 3 inches of soil and grass roots with a hand weeder, as mentioned above. Before June and after October 10 one may expect to find them from 3 to 6 inches deep, when it is necessary to use a grubbing hoe (mattock), a much slower and more laborious procedure.

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