// Disable all anisotropic filtering

QualitySettings.anisotropicFiltering = AnisotropicFiltering.Disable;

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
void Awake() {
QualitySettings.anisotropicFiltering = AnisotropicFiltering.Disable;
}
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

def Awake():
QualitySettings.anisotropicFiltering = AnisotropicFiltering.Disable