Affected Plant Parts
Citrus green symptoms vary depending on the citrus species and the environmental conditions. The symptoms may initially appear on a single shoot. The most common symptoms to appear in early stages are blotchy, mottled leaves. Leaf mottling, asymmetric chlorosis, and yellowing of veins and midribs will likely show up as the disease progresses. Infected trees will produce fewer, smaller, bitter-tasting fruits that oftentimes remain green in color. In later stages of the disease, symptoms on leaves might resemble nutritional deficiencies and may be misdiagnosed. Another symptom seen with citrus greening is vine corking. Though, vine corking could also be due to a citrus tristeza virus infection.
The Asian citrus psyllid is a tiny, white-brown, mottled insect that is about the size of an aphid. The adult psyllid feeds with its head down, almost touching the leaf, and the rest of its body is raised from the surface at an almost 45-degree angle with its tail in the air. No other citrus pests position their bodies like this while feeding. Adults typically live 1-2 months. Females lay tiny yellow-orange, almond-shaped eggs in the folds of developing citrus leaves. Each female can lay several hundred eggs during her lifespan. Psyllid produce white waxy tubules around their rear end. Stages of the psyllid can live anywhere on the tree, but the immature stages and eggs will be found on young leaves. With time, psyllid presence on trees give rise to the formation of sooty mold.
Citrus greening is a bacterial disease, exclusive on the citrus genus. The bacteria is vectored and transmitted by Asian citrus psyllid (Diaphorina citri) and African citrus psyllid (Trioza erytreae).
Citrus greening can kill trees, which severely reduces production. The bacteria is spread from tree-to-tree by psyllid vectors. Nothing can be done once a tree is infected; there is no cure for citrus greening.
एशियन साइट्रस सिलिड को हटा दें अन्यथा ये अन्य पेड़ों को संक्रमित कर सकते हैं।
सिलसिलेवार उपचारों में उन्हीं सक्रिय सामग्रियों पर आधारित उत्पादों का प्रयोग न करें। इससे किसी उपयोग की गई विशिष्ट सामग्री के प्रति प्रतिरोध उत्पन्न हो सकता है।
विश्व के एक अथवा अधिक भागों में प्रयोग किये जाने वाले उत्पादों में निम्न सामग्रियाँ हो सकती हैं :
ग्रुप 1: इमिदाक्लोप्रिद, एसेतमिप्रिड्, और थियमेतोक्साम्
ग्रुप 2: एबामेक्तिन (के साथ सम्मिलन में थियमेतोक्साम्)
ग्रुप 3: डाइमेथोएट
ग्रुप 4: फेंप्रोपाथरिन
ग्रुप 5: डाइफ़्लुबेंजूरोन
अज़ादिराच्तिन, नीम तेल, पाइरिथ्रिन्स, और फैटी एसिड के पोटैशियम लवण
*Names marked in red are considered to be highly poisonous to beneficial insects.
*Names marked in green are considered to be organic and IPM (integrated pest management) compatible.