No abstract

Onions were planted with a veebelt seeder in 18 in rows at three locations. Plots were: 10 ft of double row x four replications at Grant, (1-in planter shoe, planted 6 May); 19 ft of single row x five replications at the M.S.U. Muck Crops Experimental Farm (1-in shoe, planted 13 May); and 10 ft of double row x six replications at Hudsonville (2-in shoe, planted 5 May). Treatments were arranged in a randomized complete block design and applied in the furrow at planting (granular materials) or in a 2- to 3-in band over the row (soil drenches). Soil drenches were applied at 50 gal/acre with a hand sprayer with the initial application date corresponding to the first appearance of onion maggot eggs. Pydrin 2.4EC (0.1 lb. (AI)/acre) was applied to all plots twice during Aug. for thrips control. After plant emergence, but before onion maggot oviposition, 100-plant sections of row were marked out in each plot. Counts of onion maggot damaged plants within those 100-plant sections were made weekly through the end of the first generation damage (5 July). Stand counts within the 100-plant section were taken on 20 to 21 June and 5 July. Yields were taken from 5 ft of double row per plot at Grant and Hudsonville and 10 ft of single row at the M.S.U. Muck Farm on 29 Sept. and 1 Sept., and 4 Oct., respectively.

Seedling cauliflower were transplanted on 1 Aug., 1983, at the M.S.U. Entomol. Res. facility on campus. Plots were three rows wide by 20 ft long. Treatments were arranged in a randomized complete block design with four replications per treatment. A Lorsban drench was applied to all plots 3 Aug. at 50 gal/acre for cabbage maggot control. Foliar treatments were applied with a tractor-mounted boom sprayer at 30 gal/acre. Treatments were applied on 12, 20, 24, and 31 Aug., and 7, 15, and 26 Sept. Weekly insect counts were taken on two entire plants from the middle row of each plot.

Treatments were arranged in a randomized complete block design with four replications (= blocks). Each plot was 3 rows by 25 ft long. Treatments were applied on Jun 30; Jul 8, 16, 22, 29; Aug 5, 12 and 25 with a tractor-mounted boom sprayer with drop nozzles at 30 gpa. Sweep samples were taken weekly from each plot, all insects from the sweep samples, beneficial or pests, were recorded. Plots were checked for early damage due to carrot weevil on Jun 23. Weekly observations for early signs of aster yellows disease were made in each plot. Five plants from each plot were harvested on Jul 23 for estimation of early season damage and 15 additional plants were harvested on Sep 1.

Plots were established in a grower’s field in Oceana Courty, MI, one of the major asparagus growing regions of the state. The light, sandy soil in this field had supported heavy cutworm infestations in the past. Cutworm counts were taken in Oct. 1982 by scraping 2 inches of top soil around 30 crowns. An average of six cutworms per crown was recorded. On 27 Apr., cutworm counts were done as before and an average of only one cutworm per crown was found. Apparently the overwintering mortality was quite high. Plots were established in a heavily infested portion of the same field and were 6 rows wide by 60 ft. long. Treatments were arranged in a complete randomized design with three replications per treatment. Sampling in the plots just before treatment on 16 May yielded an average of two cutworms per crown. The following day, counts of dead larvae per 40 row-ft from the two center rows (80 total row ft per plot) and number of crowns in each plot was recorded. One week later (23 May), damaged spears and number of live larvae were counted on three per plot.