Year: 1976
Type: book
Abstract: Diagram on cover shows alternate middle row spray pattern. Connecticut Experiment StationBulletin 764 shown in Table 5, all fruit from the dwarf Lodi, Mcintosh, and Red Delicious trees in these plots were picked and scored.For control of insect pests on peaches (Table 11), two replicates consisting of 3 trees of each variety (Harbelle, Red Haven, Glo Haven or Harmony) were sprayed and 1/2 bushel from each of the six treated trees was scored.Mites were sampled as described by Moore (1971).In the reduced spray plots (Tables 3 & 6), 20 leaves were taken from 3 trees of each variety per treatment.Ten leaves per tree were taken from 3 Spartan and 3 Smoothee apple trees per treatment in the miticide test (Table 8).In the test using candidate insecticide formulations (Table 10), 20 leaves per tree were sampled from each of two Red Delicious trees.Aphids were counted in the field on the distal 3 leaves of 5 tagged terminals on one Cortland, Red Delicious and Baldwin tree per plot in the reduced spray programs (Table 3).For the full and half spray programs, two tagged terminals on each of three Spartan and Mcintosh trees were counted in the aphid test (Table 7).A list of pesticides used and their mammalian toxicities are found in Appendix I. Apple and peach pests that these materials are registered to control are found in Appendix II. RBULTSWeekly concentrate (lOx) applications of half sprays combining Guthion 50WP (6.0 oz/acre) and Zolone 25WP (12 or 16 oz/acre) at substantially reduced rates (Table 1) produced 92.9% fruit free from insect damage (Table 2).Most of the damage to apples was caused by apple maggot (3.4%) while the remaining apple pests were adequately controlled.Dikar 80WP applied at several rates during the season (Table 1) controlled apple scab and other diseases (Table 2).Zolone 25WP applied at a rate of 12 oz/acre as a half spray (Table 1) was used for aphid control.Apple aphids, Aphis pomi , began to increase in this plot in mid-June reaching their peak in late June (128.2/terminal)and then declined to 47/terminal in July (Table 3).Syrphus torus , a syrphid fly larval predator, followed a similar pattern while Aphidoletes aphid imyza , a midge larvae predator, continued to increase throughout this period reaching a peak of 3.3/terminal in July.Panonychus ulmi , the European red mite (BRM) , did not become numerous in this plot (Table 3) until August 26 (3.1/leaf); however, no special miticide appli- cations were necessary other than Dikar and Zolone which were applied seasonally (Table 1).The mite predators, Amblysecius fallacis and Zetzellia mali , were at low levels throughout the season.In the reduced spray plot (Table 1), Torak 4EC was applied at 1 .5 qts per acre as a concentrate full spray at Pink, Petal Fall and First Cover.Zolone 25WP was applied at 1.5 lbs /acre as a half spray at 14 day intervals
Author: Richard C. Moore
Language: English
Subfield: Insect Science
Domain: Life Sciences
SDG: Zero hunger
Open Access status: green
OpenAlex ID: W2493655929