Promotes elongation and formation of roots, and acts as a growth inhibitor at higher concentration. Naphthalene acetic acid (NAA) white crystal, ... thinning agent in apple ,pears,olives,citrus,and other fruit,Ø And to induce flowering in pineapples. Widely used ... culture, can prevent premature flower and fruit drop in fruit and other crops, improve the setting flowering. Naphthalene acetic acid ,NAA