QASs (2Br, 1Asp, 2Asp, 2Ala, 3Ala) the difference to the references was statistically significant (Fig. ). The length of the substituent in the 1-alkylquininium cation had no effect on the performance of the compounds with bromide anion, while in the case of L-asparaginate and L-alaninate, 2Asp and 2Ala containing an intermediate-length (octyl) substituent had the best effect against adult weevils (T equal to 136 and 139, respectively). However, these results