In this Act, unless there is anything repugnant in the subject or context,—
(a)“crops” includes all agricultural or horticultural crops 9[and all trees, bushes or plants];
(b)“import” means the bringing or taking by sea, 10[land or air] 11[across any customs frontier as defined by the Central Government]; 12***
(c)“infection” means infection by any insect, fungus or other pest injurious to a crop; 13***
14* * * * *