Reivindicaci n 1 Procedimiento para mejorar la utilizaci n de la potencial de producci n de una planta transg nica y 2Fo para controlar 2Fcombatir plagas de insectos o nematodos caracterizado porque la planta se trata con una cantidad efectiva de al menos un compuesto de la f rmula ( C₁₋₈ substituted alkyl group having at least one substituent selected from the group consisting of halogen, hydroxy, cyano, nitro, amino, C₁₋₃ haloalkyl group,Alcoxi c83218s833183232e group,C₁₋₃ haloalkoxy group,Cilt alkylthio group,C₁₋₃ haloalkylthio group,C83216c833183323 tar group；Halogenated tar group c83321i833183323；C83321y-833183323 tar group；a. Halogelsulfonilo c83321s-833183223 and c8321g-833123；a. Lease Group No. c83218c83331-83323；furthermore, an arbitrary saturated carbon atom in said optionally substituted C₁₋₈ alkyl group； n represents 0, 1, 2, 3 or 4, preferably 0, 1 or 2； R¹ represents hydrogen, halogen, C₁₋₈ cyanoalkyl or C₁₋₈ haloalkyl；RZ represents hydrogen, halogen, cyanogen or c83218c833288o halogen tar c83318328；R³ represents O or S； R⁴ represents O or S； Y individually represents hydrogen, halogen, cyano, nitro, C₁₋₆ alkyl group,C₁₋₆ haloalkyl group,C₂₋₆ alkenyl group,C₂₋₆ haloalkenyl group,C₂₋₆ alkynyl group,C₂₋₆ haloalkynyl group,C₃₋₆ cycloalkyl group,C₃₋₆ halocycloalkyl group,C₁₋₆ alkoxy group,C₁₋₆ haloalkoxy group,Cilt alkylthio group,C₁₋₆ haloalkylthio group,C₁₋₆ alkylsulfinyl group,a. Halogenated tar group c83216c831832626；C₁₋₆ alkylsulfonyl group,or C₁₋₆ haloalkylsulfonyl group；m represents 0, 1, 2, 3, or 4； X represents a C₁₋₈ alkyl group or a substituted C₁₋₈ alkyl group having at least one substituent selected from the group consisting of halogen, hydroxy, cyano, nitro, amino, C₁₋₃ haloalkyl group,Alcoxi c83218s833183232e group,C₁₋₃ haloalkoxy group. Claim 2: Method according to claim 1, characterized in that the compound of the formula (1) is the formula (2),in which Hal represents F, Cl, I or Br； and X represents C₁₋₆ alkyl or substituted C₁₋₆ alkyl ha
