Leafminer Control on Carrot with Trigard, Winter, 1982-83

Abstract

Abstract ‘Pak Mor’ carrots were planted 15 Nov. in Montverde muck on a commercial vegetable farm in Zellwood, Fl. The carrots were planted in two, four-row bands (each band was 4-in wide), 10-in apart on raised beds on 48-in centers. Because there were two bands per bed, spraying was based on 24-in centers. A plot consisted of 15 ft of one bed. Plots were separated by one unsprayed bed. Treatments were replicated four times in a randomized complete block design. Sprays were applied as a band over the top of each band of carrots at 40 lb/in2 and 2 mph. The volume of spray for the first and second applications was 25 and 63 gal/acre, respectively. The volume for the remaining treatments was 50 gal/acre. All rates were applied on 9 Dec. The 0.125 and 0.500 rates were applied again on 15, 22, and 28 Dec. One meter of carrot tops was collected from each of the two bands in each plot on 5 Jan. The samples were maintained at 25 ± 1°C in rearing containers until all the larvae exited the leaves. The rearing container consisted of a 9-in by 12 1/4-in by 4 1/8-in deep clear plastic box, with lid, containing a 1/4-in wire cloth to support the foliage and lined with a paper towel to soak up excess moisture. The puparia were collected and held in pill cups until the adults emerged and died. The number of adults, normal and deformed puparia, unemerged puparia, and parasites were recorded.