Plant lots of insect-friendly or bird-friendly plants, either amongst your crops or nearby. They attract natural predators such as birds which eat slugs, hoverflies which eat aphids and bees which pollinate your crops. For a list of wildlife-friendly plants click here.
Sadaqah Jariyah. When a man passes away, his good deeds will also come to an end except for three: Sadaqah Jariyah (ceaseless charity); a knowledge which is beneficial, or a virtuous descendant who prays for him (for the deceased). Narrated by Abu Hurairah, Sahih Muslim.
As Salaam Aleikum wa Rahmatullahi wa Barakatuh. (May Allah's Peace, Mercy and Blessings be upon all of you). One of our brothers/sisters has asked this question: To what extent is use of taweez or amulets allowed in Islam.