Crop rotation effects on populations of Porphyrophora tritici (bodenheimer)‎ (homoptera : margarodidae)‎ in barley in Northern Syria

الملخص EN

A survey of porphyrophora tritici bodenheimer was conducted in three long term barley trials in a marginal rainfall environment in northern syria in which barley was grown every year or was alternated with forage legumes or a clean fallow.

significant differences were noted between densities of second instar cysts on plants among the different rotation schemes.

continuously planted barley was most severely infested by p.

tritici, followed by rotations of barley-legume and barley-fallow, respectively.

fertill.z;er applications and tillage schemes employed in the three rotation studies were not correlated with p.

tritici populations .

p.

tritici infestations in marginal rainfed environments may be managed or prevented from causing economic loss by using either a forage legume or clean fallow to disrupt barley monocultures.

for crop rotation to be practical in marginal environments, xr acceptable forage legume must be developed as an alternative to barley to permit farmers of low rainfall environments to maintain animals even in drought years.