How to Manage Pests

Pests in Gardens and Landscapes

Watering citrus

Watering correctly is critical to the development of good quality fruit and allows trees to preserve a natural resistance to fungal diseases such as Alternaria, oak root fungus, or Phytophthora. However, overwatering can also predispose the tree to these root and crown rots.

During the summer, citrus will require about 4 to 6 inches of water per month. However, depending upon your soil type, this amount may be divided up into several applications. Ideally, in hot summer climate zones, you may want to irrigate about every 7 to 10 days during the middle of the summer. You may irrigate your trees using a drip system with either two to four emitters per tree or using small microspray emitters. The root zone of citrus is shallow and drippers need to be placed at the base of the trunk of newly planted trees to keep the root ball moist until roots grow into the native soil. Apply water further from the tree trunk as trees become established.

Apply water further from the trunk as trees
 become established
Apply water further from the trunk as trees become established

Statewide IPM Program, Agriculture and Natural Resources, University of California
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