diff --git a/tractor/_actor.py b/tractor/_actor.py
index 443c48c..867403f 100644
--- a/tractor/_actor.py
+++ b/tractor/_actor.py
@@ -179,6 +179,9 @@ class Actor:
     # Information about `__main__` from parent
     _parent_main_data: Dict[str, str]
 
+    # if started on ``asycio`` running ``trio`` in guest mode
+    _infected_aio: bool = False
+
     def __init__(
         self,
         name: str,
@@ -539,58 +542,6 @@ class Actor:
                 f"Exiting msg loop for {chan} from {chan.uid} "
                 f"with last msg:\n{msg}")
 
-    def _mp_main(
-        self,
-        accept_addr: Tuple[str, int],
-        forkserver_info: Tuple[Any, Any, Any, Any, Any],
-        start_method: str,
-        parent_addr: Tuple[str, int] = None
-    ) -> None:
-        """The routine called *after fork* which invokes a fresh ``trio.run``
-        """
-        self._forkserver_info = forkserver_info
-        from ._spawn import try_set_start_method
-        spawn_ctx = try_set_start_method(start_method)
-
-        if self.loglevel is not None:
-            log.info(
-                f"Setting loglevel for {self.uid} to {self.loglevel}")
-            get_console_log(self.loglevel)
-
-        assert spawn_ctx
-        log.info(
-            f"Started new {spawn_ctx.current_process()} for {self.uid}")
-
-        _state._current_actor = self
-
-        log.debug(f"parent_addr is {parent_addr}")
-        try:
-            trio.run(partial(
-                self._async_main, accept_addr, parent_addr=parent_addr))
-        except KeyboardInterrupt:
-            pass  # handle it the same way trio does?
-        log.info(f"Actor {self.uid} terminated")
-
-    async def _trip_main(
-        self,
-        accept_addr: Tuple[str, int],
-        parent_addr: Tuple[str, int] = None
-    ) -> None:
-        """Entry point for a `trio_run_in_process` subactor.
-
-        Here we don't need to call `trio.run()` since trip does that as
-        part of its subprocess startup sequence.
-        """
-        if self.loglevel is not None:
-            log.info(
-                f"Setting loglevel for {self.uid} to {self.loglevel}")
-            get_console_log(self.loglevel)
-
-        log.info(f"Started new TRIP process for {self.uid}")
-        _state._current_actor = self
-        await self._async_main(accept_addr, parent_addr=parent_addr)
-        log.info(f"Actor {self.uid} terminated")
-
     async def _async_main(
         self,
         accept_addr: Tuple[str, int],
@@ -846,6 +797,8 @@ class Actor:
         log.info(f"Handshake with actor {uid}@{chan.raddr} complete")
         return uid
 
+    def is_infected_aio(self) -> bool:
+        return self._infected_aio
 
 class Arbiter(Actor):
     """A special actor who knows all the other actors and always has