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Early Season Insect Control with In-Furrow Insecticides, 1988


 This study was designed to compare formulations of different insecticides applied in-furrow for control of early-season insects in cotton and their effect on plant growth The soil type in this experiment was Houston clay. Cotton was treated with standard fungicides, planted with a John Deere flex-71 planter, and insecticides were applied through John Deere insecticide boxes which were ground driven. Planting was made in low beds, 3 to 3.5 inches high, on 22 Apr. Plants emerged to stand by 2 May. The experimental design was a randomized complete block of 4 row, 40 ft plots, with 4 replications. The soil condition stayed wet and cold until 1 Jun. Poor cotton growing conditions characterized the spring growing period. Thrips, adults and larvae, were collected by beating 25 randomly selected plants over hardware cloth on 11, 18, 25, and 31 May. Aphids were counted 18 and 25 May. Plant-feeding bugs were collected on 7 Jun with a D-vac machine, sampling 40 row ft/plot. On 7 Jun, 10 consecutive plants in a row were collected, leaves were removed and weighed, and the number of squares were counted. Plants were about 30 days old. Previous data showed a good correlation between leaf weight and leaf area when measured with an area meter. Yields were estimated by harvesting the center 2 rows with a brush stripper on 31 Aug, 131 d after planting.