Response of Liriomyza trifolii (Diptera: Agromyzidae) to Insecticides on Tomato1

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Abstract
Insecticides were evaluated in the field and then in the laboratory for control of Liriomyza trifolii (Burgess) on tomato. In the field, the number of large leaf mines (ca. 1.2 cm or longer) produced and the number of larvae successfully pupating were less from foliage sprayed weekly with MK 936 (a mixture of 80% avermectin B1a and 20% avermectin B1b) or cyromazine (N-cyclopropyl-1,3,5-triazine-2,4,6-triamine) than from foliage sprayed with water. In the laboratory, mortality of L. trifolii adults was relatively low after exposure to surfaces treated with either compound. Both compounds induced high mortality in 1- and 3-day-old larvae. MK 936 also inhibited oviposition and killed larvae during eclosion. Thus, egg hatch was incomplete and leaf mines were not formed.