lettuce drop

Lettuce drop-affected plants may appear to have collapsed.  Upon closer inspection, the dark, irregular fungal structures known as sclerotia can be found associated with the diseased plant. 

Figure 1. Lettuce drop. Note two plants in foreground that have collapsed. Figure 1. Lettuce drop. Note two plants in foreground that have collapsed.
Figure 2. Lettuce drop. Note plant in foreground in process of collapse. Figure 2. Lettuce drop. Note plant in foreground in process of collapse.
Figure 3. Lettuce drop. Figure 3. Lettuce drop.
Figure 4. Lettuce drop. Figure 4. Lettuce drop.
Figure 5. Sclerotia from lettuce plant affected by drop. Figure 5. Sclerotia from lettuce plant affected by drop.
Figure 6. Sclerotia from lettuce plant affected by drop. Figure 6. Sclerotia from lettuce plant affected by drop.