Treatise on injurious and beneficial insects to crops

Eitemau Tebyg

• Beneficial insects
  gan: Swan, L A
  Cyhoeddwyd: (1964)
• Treatise on injurious and beneficail insect & crops /
  gan: PackardA S
  Cyhoeddwyd: (1987)
• INSECTS: BENEFICIAL AND HARMFUL ASPECTS
  gan: AMBROSE, DUNSTON P
  Cyhoeddwyd: (2007)
• Beneficial insects : nature's alternatives to chemical insecticides:animal predation,parasitism,disease organisms /
  gan: Swan, Lester A.
  Cyhoeddwyd: (1964)
• Insects and mites of crops
  gan: Nair, M R G K
  Cyhoeddwyd: (1975)