Sugarbeet Root Maggot Control, 1990

Sugarbeets were planted in 2 fields near Rupert, Idaho. The soil type was Portneuf silt loam. Location 1 (irrigation by wheel lines) was planted 25 Apr using WS 88 seed and location 2 (irrigation by furrow irrigation) was planted 20 Apr using PM9 seed. Eleven treatments and an untreated check were replicated six times in a randomized complete block design. Individual plots were 6 rows (22 inch row spacing) by 30 ft. Alleys were cut between plots to give 25 ft of row/plot. Aldicarb was applied in either a modified in furrow treatment (MIF) or a banded furrow treatment in front of the press wheel. Tenax, Lorsban, and Counter were applied in a 4—5 inch band behind the press wheel and chain incorporated. Furadan was applied 25 May at early fly emergence in a 3-4 inch band sprayed over the top of the beet row using 50 gal water/acre 930 psi, hollow cone single nozzle). Temik was applied post emergence in a 4-5 inch band over the row and chain incorporated on 4 Jun. On 5 Jul five adjacent beets were dug from the middle of rows 2 and 5 to give 10 beets/plot for rating for root maggot damage. The beets were washed and rated using the following rating scheme 0 = no scars; 1 = 1-4 small scars of pinhead size; 2 = 5-10 small scars to 3 large scars; 3 = more than 3 large scars; 4 = Vi to 3A root area blackened by scars; 5 = more than % of root area damaged.