For a medical symptom description of 'Muscle jerks', the following symptom information may be relevant to the symptoms: Muscle spasms (symptom). However, note that other causes of the symptom 'Muscle jerks' may be possible. More information on symptom: Muscle spasms: Muscle spasms.
Feeling the Heat. Excessive sun exposure and cold temperatures can turn lemon tree leaves yellow. Scorched leaves, which look bleached or have yellow patches, often appear only in parts of the tree facing the afternoon sun, but a cold snap affects leaves all over the tree.ellow lemon tree leaves can be a sign of disease. A lemon tree growing on poorly drained soil can develop Phytophthora root rot, which causes pale green to yellowish leaves.
Leaf Spot. Leaf spot is a generic name for a fungal disease that can afflict almost any shade tree and whose telltale symptom is brown spots on leaves. Size and shape of the spots vary depending on what type of fungus has infected the tree. The color of the spot can also vary--it is frequently brown, but can also be light brown or tan.