LIST OF ILLUSTRATIONS xvii 



FIG. PAGE 



115. Argentine ant, which does much damage .... 202 



116. Grasshopper 204 



117. A mosquito which carries malaria 205 



118. A mosquito which does not carry malaria .... 206 



119. Wriggler (larva) of a mosquito which carries malaria . 206 



120. Wriggler (larva) of a mosquito which does not carry 



malaria 207 



121. Pupa of mosquito . 208 



122. An apple branch attacked by aphis 212 



123. A greenhouse scale (hemispherical scale) on a leaf . . 216 



124. Black scale on lemon 217 



125. Vine hopper 218 



126. Red spider of orange in feeding position ... . . 219 



127. Egg of the red spider of the orange 220 



128. Centiped, which damages asparagus 220 



129. Lamp-chimney breeding cages placed over plants growing 



in pots 222 



130. Mold growing on a piece of bread 228 



131. Blue mold on lemon 230 



132. The blue mold has not spread from the moldy lemon to 



the others in the box, because their skins are not broken 231 



133. Brown rot spreading in spite of the fact that the skin has 



not been injured in any way ...... 232 



134. Powdery mildew on rose leaf, causing a whitish appearance 235 



135. A bunch of grapes attacked by oidium or powdery mildew 236 



136. Oidium or powdery mildew on grapes, causing a whitish 



appearance 237 



137. Corn smut 238 



138. Asparagus rust 239 



139. Rust on rose leaf 240 



140. Peach blight 242 



141. Pear blight attacking flowers and twig .... 243 



142. Pear blight entering trunk of tree through a small infested 



branch 243 



143. Walnut blight on leaves 244 



144. Walnut blight on nuts 244 



145. Olive knot 245 



