. Commercial mass culture of the California red scale parasite : Aphytis lignanensis. Citrus; Scale insects. when the compartment is raised; (2) serves as a stop for the levers when these are depressed; and (3) serves to strengthen the corner of the three-sided drawer, since only the inner plate is attached to the bottom. These ends of the drawer which form the inside plates have a groove rabbeted across them through which a cleat on the "floating" plate travels. On the out- side surface of this middle plate, a second cleat travels in a groove rabbeted from the outside plate which se
. Commercial mass culture of the California red scale parasite : Aphytis lignanensis. Citrus; Scale insects. when the compartment is raised; (2) serves as a stop for the levers when these are depressed; and (3) serves to strengthen the corner of the three-sided drawer, since only the inner plate is attached to the bottom. These ends of the drawer which form the inside plates have a groove rabbeted across them through which a cleat on the "floating" plate travels. On the out- side surface of this middle plate, a second cleat travels in a groove rabbeted from the outside plate which serves as part of the unit wall. This slide arrangement permits the unit to carry the full weight of the loaded compartment even when the compartment is fully withdrawn from the unit. Figure 15, B shows struc- tural details and dimensions of the drawer assembly. In a mass-production program em- ploying two men, 10 such units each having 6 compartments are required. In a three-man operation, 20 units each having 5 compartments are required. These numbers allow for one spare unit plus one unit required in the rotational operation of the parasite culture. Price and depreciation of these units will be discussed in a later section. Squash-Holding Racks and Trays. Figure 16 shows a squash-holding rack loaded with squash. As designed, this rack holds a minimum of 48 squash, or one and one fifth times as many as would be infested daily in a three-man opera- tion. Forty-four racks would be required to carry out such an operation. Reducing the over-all height to accommodate 7 trays instead of 8 results in a rack ca- pable of holding 42 squash, or two days' output, in a two-man operation. Figure 17 shows the structural details of a rack for 42 squash. Approximately 30 such racks would be required. Trays for these racks are 42 in. long and 16 in. deep. For a three-man in- sectary, a total of 352 such trays would be required; for a two-man operation,. Fig A squash-holding rack loaded with sca
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