Vergara - 1976 - Physiological and morphological adaptability of ri

386 CLIMATE AND RICE
in June and July after multiplication in the subtropical zone. The inflow of warm
air masses is clearly shown by the elevation of the temperature over about 20°C
and the plentiful rainfall which enables rice to be grown. The northward migration
of the planthoppers depends passively on the movement of the air mass.
and the planlhoppers are thus considered to have adapted very well to their
environment. As shown in Fig. 7. two cycles of population growth of It’. lzrgens
occur in Taiwan. depending upon the two cropping system of rice beginning in
February or March. 1n Japan immigration occurs in late June and July. consequently
there is only one cycle of population growth of By“. Iugens. In Northem
Japan no immigrants of N. iugens have been found in substantial numbers.
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